In 1959, researchers discovered that the Black Vulture was uncommon in the western region of Coahuila, Mexico. Why was this?
- The desert landscape lacks suitable carrion sources
- Black Vultures prefer cooler climates
- The Black Vulture population was declining at the time
- Western Coahuila was home to a predator of Black Vultures
Correct Answer: The desert landscape lacks suitable carrion sources
Correct Answer Explanation: While Black Vultures are common in the eastern part of Coahuila, their presence is limited in the west due to the lack of carrion sources in the arid desert environment. This highlights the impact of habitat on bird distribution.
What evidence suggests that the Swainson’s Hawk breeds in Coahuila?
- The presence of Swainson’s Hawks in Coahuila during the summer months
- The observation of Swainson’s Hawks building nests in Coahuila
- The discovery of a Swainson’s Hawk with enlarged testes in June
- The sighting of Swainson’s Hawk chicks in Coahuila
Correct Answer: The discovery of a Swainson’s Hawk with enlarged testes in June
Correct Answer Explanation: The presence of a male Swainson’s Hawk with enlarged testes in June indicates that the species is breeding in Coahuila. This provides direct evidence of reproduction within the state.
The presence of what type of forest in southeastern Coahuila provides habitat for certain northern bird species like the Goshawk and Pine Siskin?
- Tropical rainforest
- Temperate deciduous forest
- Boreal forest
- Mangrove forest
Correct Answer: Boreal forest
Correct Answer Explanation: The presence of boreal forests in southeastern Coahuila creates a unique habitat for certain northern bird species, such as Goshawks and Pine Siskins. These forests, characterized by cold climates and coniferous trees, provide essential resources for these boreal-adapted species.
Which bird species is the most abundant in the Sierra del Carmen region of Coahuila?
- Black-eared Bushtit
- White-necked Raven
- Mexican Jay
- Acorn Woodpecker
Correct Answer: Mexican Jay
Correct Answer Explanation: The Mexican Jay is the most abundant bird species found in the Sierra del Carmen, highlighting the suitability of the region’s oak and pine-oak habitats for this species.
The cooling climate during the late Pliocene and Pleistocene periods had a significant impact on the avifauna of Coahuila. What was the primary effect of this climate change?
- It drove many birds northward, expanding their range.
- It led to the extinction of many bird species in Coahuila.
- It caused a decrease in the diversity of bird species in the state.
- It drove many birds southward, contributing to the present avifauna.
Correct Answer: It drove many birds southward, contributing to the present avifauna.
Correct Answer Explanation: The cooling climate during the late Pliocene and Pleistocene periods drove many birds southward, contributing to the current avian diversity in Coahuila. This southward migration resulted in a unique mix of species adapted to both northern and southern habitats.
What is the term for a gradual change in a trait over a geographic range, like the variation in the Red-shafted Flicker subspecies in Coahuila?
- Disjunct distribution
- Interspecific hybrid
- Cline
- Niche
Correct Answer: Cline
Correct Answer Explanation: A cline refers to a gradual change in a trait over a geographic range. In the case of the Red-shafted Flicker, the subspecies C. c. nanus, common throughout Coahuila, exhibits some intergradation with C. c. collaris, highlighting a cline in physical characteristics across the state.
The observation of a male Painted Redstart with enlarged testes in April, coupled with the presence of fledglings in the Sierra del Carmen, provides evidence of what?
- The migration of the Painted Redstart through Coahuila
- The wintering of the Painted Redstart in Coahuila
- The breeding of the Painted Redstart in Coahuila
- The intergradation of the Painted Redstart subspecies in Coahuila
Correct Answer: The breeding of the Painted Redstart in Coahuila
Correct Answer Explanation: The presence of a male Painted Redstart with enlarged testes in April, indicating breeding condition, along with the observation of fledglings, confirms the species’ breeding activity in the Sierra del Carmen region of Coahuila.
Which of the following species is NOT a breeding resident in Coahuila, Mexico?
- Western Tanager
- Black-headed Grosbeak
- Curve-billed Thrasher
- Mockingbird
Correct Answer: Western Tanager
Correct Answer Explanation: While the Western Tanager is a common migrant in Coahuila, it does not breed in the state. This highlights the difference between migrating and breeding bird populations within the region.
What is the term for a region characterized by a distinct set of ecological communities, like the arid western regions of Coahuila?
- Biotic Province
- Niche
- Insularity
- Flyway
Correct Answer: Biotic Province
Correct Answer Explanation: A biotic province refers to a region with a distinct set of ecological communities. The arid western regions of Coahuila, characterized by specific climate, topography, and vegetation, constitute a distinct biotic province, influencing the distribution of bird species within the state.
The presence of a female Roadrunner with a large ovum in June indicates what?
- The Roadrunner is a migrant through Coahuila
- The Roadrunner is a winter resident in Coahuila
- The Roadrunner breeds in Coahuila
- The Roadrunner population is declining in Coahuila
Correct Answer: The Roadrunner breeds in Coahuila
Correct Answer Explanation: The presence of a female Roadrunner with a large ovum in June provides direct evidence that the species breeds in Coahuila. This suggests that the state offers suitable conditions for Roadrunner reproduction.
Which bird family has the most significant contribution to the breeding avifauna of Coahuila, based on their origins?
- Old World
- South America
- North America
- Unanalyzed group
Correct Answer: North America
Correct Answer Explanation: While the breeding bird families of Coahuila have origins in the Old World, South America, and North America, the North American lineage has the most significant contribution to the state’s avifauna. This reflects the historical influence of North American birds migrating southward and adapting to the Coahuila environment.
The observation of a male Black-eared Bushtit with enlarged testes in March suggests what?
- The Black-eared Bushtit is a winter visitor to Coahuila
- The Black-eared Bushtit is a migrant through Coahuila
- The Black-eared Bushtit breeds in Coahuila
- The Black-eared Bushtit population is declining in Coahuila
Correct Answer: The Black-eared Bushtit breeds in Coahuila
Correct Answer Explanation: The presence of a male Black-eared Bushtit with enlarged testes in March indicates breeding activity in the region. This suggests that Coahuila provides suitable conditions for Black-eared Bushtit reproduction.
The presence of a Swainson’s Hawk with enlarged testes in June indicates that this species is breeding in Coahuila. What is the term for the specific role or function of a species within an ecosystem?
- Biotic Province
- Insularity
- Niche
- Cline
Correct Answer: Niche
Correct Answer Explanation: A niche refers to the specific role or function of a species within an ecosystem. The presence of a breeding Swainson’s Hawk in Coahuila suggests that this species has found a suitable niche in the state’s environment, fulfilling a particular role within the ecosystem.
What is the term for a migration route used by birds during seasonal movements, such as the flyway that passes through Coahuila?
- Niche
- Flyway
- Insularity
- Cline
Correct Answer: Flyway
Correct Answer Explanation: A flyway refers to a migration route used by birds during seasonal movements. Coahuila is located within a significant flyway, contributing to the state’s diverse avian populations.
The isolation of bird populations in the Sierra del Carmen has led to unique adaptations. What is the term for the state of being geographically isolated, such as an island?
- Flyway
- Insularity
- Niche
- Cline
Correct Answer: Insularity
Correct Answer Explanation: Insularity refers to the state of being geographically isolated. The Sierra del Carmen, a mountainous region in northwestern Coahuila, is separated from other similar areas by vast stretches of desert, leading to the isolation of bird populations and contributing to unique adaptations.
The occurrence of the Aztec Thrush in Coahuila represents a significant range extension. What is the term for a pattern of species distribution where populations are separated by significant distances?
- Cline
- Insularity
- Disjunct distribution
- Niche
Correct Answer: Disjunct distribution
Correct Answer Explanation: Disjunct distribution refers to a pattern of species distribution where populations are separated by significant distances. The occurrence of the Aztec Thrush in Coahuila, a species typically found further south, represents a disjunct distribution, highlighting the potential influence of historical factors and environmental changes on bird populations.
The observation of a male Phainopepla with enlarged testes in April suggests that this species is breeding in Coahuila. What is the term for a region with similar climate and vegetation, resulting in a distinct array of species?
- Insularity
- Biotic Province
- Life Zone
- Niche
Correct Answer: Life Zone
Correct Answer Explanation: A life zone refers to a region with similar climate and vegetation, resulting in a distinct array of species. The presence of a breeding Phainopepla in Coahuila suggests that the state provides a suitable life zone for this species, offering appropriate conditions for reproduction.
The presence of Golden-fronted Woodpeckers with characteristics of both aurifrons and incanescens highlights the intergradation between these subspecies in Coahuila. What is the term for an offspring resulting from the breeding of two different species?
- Cline
- Interspecific hybrid
- Niche
- Insularity
Correct Answer: Interspecific hybrid
Correct Answer Explanation: An interspecific hybrid is an offspring resulting from the breeding of two different species. While the Golden-fronted Woodpecker subspecies, aurifrons and incanescens, exhibit intergradation, this refers to a blending of traits within a species, not the creation of a hybrid between two distinct species.
What evidence suggests that the Thick-billed Parrot breeds in southeastern Coahuila?
- The presence of Thick-billed Parrots in a spruce-fir-pine-aspen association
- The observation of Thick-billed Parrots feeding young
- The discovery of Thick-billed Parrot nests
- The sighting of Thick-billed Parrot eggs
Correct Answer: The presence of Thick-billed Parrots in a spruce-fir-pine-aspen association
Correct Answer Explanation: The presence of Thick-billed Parrots in a spruce-fir-pine-aspen association, a habitat suitable for breeding, suggests that this species breeds in southeastern Coahuila. This type of forest provides essential resources for nesting and raising young.
The Yellow-billed Cuckoo has been observed breeding in northeastern Coahuila. What is the term for a region characterized by arid conditions?
- Boreal
- Xeric
- Insularity
- Life Zone
Correct Answer: Xeric
Correct Answer Explanation: Xeric refers to a region characterized by arid conditions. While northeastern Coahuila is not entirely arid, the presence of breeding Yellow-billed Cuckoos indicates that the region offers suitable conditions for this species, even within a semi-arid environment.
The presence of a male Harlequin Quail collected in the Sierra del Carmen on September 7 was in breeding condition. What does this suggest about the breeding season of the Harlequin Quail in this region?
- The Harlequin Quail has a short breeding season in the Sierra del Carmen.
- The Harlequin Quail breeds year-round in the Sierra del Carmen.
- The Harlequin Quail’s breeding season extends into the fall in the Sierra del Carmen.
- The Harlequin Quail’s breeding season is limited to the spring in the Sierra del Carmen.
Correct Answer: The Harlequin Quail’s breeding season extends into the fall in the Sierra del Carmen.
Correct Answer Explanation: The presence of a male Harlequin Quail in breeding condition in September indicates that the breeding season for this species in the Sierra del Carmen region extends into the fall. This suggests that the region provides favorable conditions for breeding even during later months.
The Flammulated Owl is particularly abundant in the pines and oaks at 7000 feet in Carboneras Canyon. What is the term for the specific role or function of a species within an ecosystem?
- Biotic Province
- Niche
- Insularity
- Cline
Correct Answer: Niche
Correct Answer Explanation: A niche refers to the specific role or function of a species within an ecosystem. The abundance of Flammulated Owls in the pines and oaks at 7000 feet in Carboneras Canyon indicates that this species has found a suitable niche in this specific habitat, fulfilling a particular role within the ecosystem.
The observation of a male Yellow-throated Vireo with enlarged testes in June in Coahuila potentially suggests what?
- The Yellow-throated Vireo is a migrant through Coahuila.
- The Yellow-throated Vireo is a winter resident in Coahuila.
- The Yellow-throated Vireo is expanding its breeding range southward.
- The Yellow-throated Vireo population is declining in Coahuila.
Correct Answer: The Yellow-throated Vireo is expanding its breeding range southward.
Correct Answer Explanation: The observation of a male Yellow-throated Vireo with enlarged testes in June, indicating breeding condition, in Coahuila potentially suggests that the species is expanding its breeding range southward. This suggests that the state is offering suitable conditions for reproduction.
What evidence suggests that the Acorn Woodpecker breeds in Coahuila?
- The observation of Acorn Woodpeckers building nests in Coahuila.
- The abundance of Acorn Woodpeckers in the oak and pine-oak belts of Coahuila.
- The presence of Acorn Woodpecker chicks in Coahuila.
- The discovery of Acorn Woodpecker eggs in Coahuila.
Correct Answer: The abundance of Acorn Woodpeckers in the oak and pine-oak belts of Coahuila.
Correct Answer Explanation: While the abundance of Acorn Woodpeckers in the oak and pine-oak belts of Coahuila doesn’t directly confirm breeding, it suggests that the species finds suitable habitat and resources in the region. This is a strong indicator of breeding activity, although further evidence would be needed to definitively confirm breeding.
The presence of Summer Tanagers with characteristics of both rubra and cooperi demonstrates the intergradation between these subspecies in Coahuila. What is the term for a gradual change in a trait over a geographic range, like the variation in the Red-shafted Flicker subspecies in Coahuila?
- Cline
- Insularity
- Disjunct distribution
- Niche
Correct Answer: Cline
Correct Answer Explanation: A cline refers to a gradual change in a trait over a geographic range. In the case of the Summer Tanager, the presence of individuals with characteristics of both rubra and cooperi highlights a cline in physical characteristics across Coahuila, indicating gradual variation between subspecies over a geographic area.
The presence of a male Black-capped Vireo with enlarged testes in May suggests what?
- The Black-capped Vireo is a migrant through Coahuila.
- The Black-capped Vireo is a winter resident in Coahuila.
- The Black-capped Vireo breeds in Coahuila.
- The Black-capped Vireo population is declining in Coahuila.
Correct Answer: The Black-capped Vireo breeds in Coahuila.
Correct Answer Explanation: The presence of a male Black-capped Vireo with enlarged testes in May, indicating breeding condition, suggests that the species breeds in Coahuila. This indicates that the state offers suitable conditions for reproduction.
What evidence suggests that the Verdin breeds in Coahuila?
- The presence of Verdins in a variety of habitats in Coahuila.
- The observation of Verdins building nests in Coahuila.
- The discovery of Verdin nests with eggs in Coahuila.
- The observation of Verdins feeding young in Coahuila.
Correct Answer: The observation of Verdins building nests in Coahuila.
Correct Answer Explanation: While the presence of Verdins in a variety of habitats in Coahuila doesn’t directly confirm breeding, the observation of Verdins building nests provides strong evidence that the species breeds in the state. Nest building is a clear indicator of breeding activity.
What is the term for a region with similar climate and vegetation, resulting in a distinct array of species, such as the oak and pine-oak belts of Coahuila that support the Acorn Woodpecker?
- Insularity
- Biotic Province
- Life Zone
- Niche
Correct Answer: Life Zone
Correct Answer Explanation: A life zone refers to a region with similar climate and vegetation, resulting in a distinct array of species. The oak and pine-oak belts of Coahuila, characterized by specific climatic and vegetation conditions, constitute a life zone that supports the Acorn Woodpecker and other species adapted to this environment.
The White-necked Raven is known to breed in Coahuila. What evidence supports this claim?
- The observation of White-necked Ravens with enlarged testes in May and June.
- The presence of White-necked Ravens in a variety of habitats in Coahuila.
- The observation of White-necked Ravens feeding young in Coahuila.
- The discovery of White-necked Raven nests with eggs in Coahuila.
Correct Answer: The observation of White-necked Ravens with enlarged testes in May and June.
Correct Answer Explanation: The observation of White-necked Ravens with enlarged testes in May and June, indicating breeding condition, provides direct evidence that the species breeds in Coahuila. This suggests that the state offers suitable conditions for reproduction.
What is the term for a migration route used by birds during seasonal movements, such as the flyway that passes through Coahuila, which contributes to the state’s diverse avian populations?
- Insularity
- Niche
- Flyway
- Cline
Correct Answer: Flyway
Correct Answer Explanation: A flyway refers to a migration route used by birds during seasonal movements. Coahuila is located within a significant flyway, contributing to the state’s diverse avian populations as birds pass through the region during their seasonal migrations.
The observation of a male Pigmy Nuthatch with enlarged testes in May suggests what?
- The Pigmy Nuthatch is a migrant through Coahuila.
- The Pigmy Nuthatch is a winter resident in Coahuila.
- The Pigmy Nuthatch breeds in Coahuila.
- The Pigmy Nuthatch population is declining in Coahuila.
Correct Answer: The Pigmy Nuthatch breeds in Coahuila.
Correct Answer Explanation: The observation of a male Pigmy Nuthatch with enlarged testes in May, indicating breeding condition, suggests that the species breeds in Coahuila. This suggests that the state offers suitable conditions for reproduction.
The observation of a male Painted Redstart with enlarged testes in April, coupled with the presence of fledglings in the Sierra del Carmen, indicates what?
- The Painted Redstart is a migrant through Coahuila.
- The Painted Redstart is a winter resident in Coahuila.
- The Painted Redstart breeds in Coahuila.
- The Painted Redstart population is declining in Coahuila.
Correct Answer: The Painted Redstart breeds in Coahuila.
Correct Answer Explanation: The presence of a male Painted Redstart with enlarged testes in April, indicating breeding condition, along with the observation of fledglings, confirms the species’ breeding activity in the Sierra del Carmen region of Coahuila.
The presence of a female Roadrunner with a large ovum in June indicates what?
- The Roadrunner is a migrant through Coahuila.
- The Roadrunner is a winter resident in Coahuila.
- The Roadrunner breeds in Coahuila.
- The Roadrunner population is declining in Coahuila.
Correct Answer: The Roadrunner breeds in Coahuila.
Correct Answer Explanation: The presence of a female Roadrunner with a large ovum in June provides direct evidence that the species breeds in Coahuila. This suggests that the state offers suitable conditions for Roadrunner reproduction.
The observation of a male Yellow-throated Vireo with enlarged testes in June in Coahuila potentially suggests what?
- The Yellow-throated Vireo is a migrant through Coahuila.
- The Yellow-throated Vireo is a winter resident in Coahuila.
- The Yellow-throated Vireo is expanding its breeding range southward.
- The Yellow-throated Vireo population is declining in Coahuila.
Correct Answer: The Yellow-throated Vireo is expanding its breeding range southward.
Correct Answer Explanation: The observation of a male Yellow-throated Vireo with enlarged testes in June, indicating breeding condition, in Coahuila potentially suggests that the species is expanding its breeding range southward. This suggests that the state is offering suitable conditions for reproduction.
What is the term for a gradual change in a trait over a geographic range, like the variation in the Red-shafted Flicker subspecies in Coahuila?
- Niche
- Cline
- Insularity
- Flyway
Correct Answer: Cline
Correct Answer Explanation: A cline refers to a gradual change in a trait over a geographic range. In the case of the Red-shafted Flicker, the subspecies C. c. nanus, common throughout Coahuila, exhibits some intergradation with C. c. collaris, highlighting a cline in physical characteristics across the state.
What evidence suggests that the Acorn Woodpecker breeds in Coahuila?
- The observation of Acorn Woodpeckers building nests in Coahuila.
- The abundance of Acorn Woodpeckers in the oak and pine-oak belts of Coahuila.
- The presence of Acorn Woodpecker chicks in Coahuila.
- The discovery of Acorn Woodpecker eggs in Coahuila.
Correct Answer: The abundance of Acorn Woodpeckers in the oak and pine-oak belts of Coahuila.
Correct Answer Explanation: While the abundance of Acorn Woodpeckers in the oak and pine-oak belts of Coahuila doesn’t directly confirm breeding, it suggests that the species finds suitable habitat and resources in the region. This is a strong indicator of breeding activity, although further evidence would be needed to definitively confirm breeding.
The presence of a male Black-capped Vireo with enlarged testes in May suggests what?
- The Black-capped Vireo is a migrant through Coahuila.
- The Black-capped Vireo is a winter resident in Coahuila.
- The Black-capped Vireo breeds in Coahuila.
- The Black-capped Vireo population is declining in Coahuila.
Correct Answer: The Black-capped Vireo breeds in Coahuila.
Correct Answer Explanation: The presence of a male Black-capped Vireo with enlarged testes in May, indicating breeding condition, suggests that the species breeds in Coahuila. This indicates that the state offers suitable conditions for reproduction.
The presence of a male Harlequin Quail collected in the Sierra del Carmen on September 7 was in breeding condition. What does this suggest about the breeding season of the Harlequin Quail in this region?
- The Harlequin Quail has a short breeding season in the Sierra del Carmen.
- The Harlequin Quail breeds year-round in the Sierra del Carmen.
- The Harlequin Quail’s breeding season extends into the fall in the Sierra del Carmen.
- The Harlequin Quail’s breeding season is limited to the spring in the Sierra del Carmen.
Correct Answer: The Harlequin Quail’s breeding season extends into the fall in the Sierra del Carmen.
Correct Answer Explanation: The presence of a male Harlequin Quail in breeding condition in September indicates that the breeding season for this species in the Sierra del Carmen region extends into the fall. This suggests that the region provides favorable conditions for breeding even during later months.
The Flammulated Owl is particularly abundant in the pines and oaks at 7000 feet in Carboneras Canyon. What is the term for the specific role or function of a species within an ecosystem?
- Biotic Province
- Niche
- Insularity
- Cline
Correct Answer: Niche
Correct Answer Explanation: A niche refers to the specific role or function of a species within an ecosystem. The abundance of Flammulated Owls in the pines and oaks at 7000 feet in Carboneras Canyon indicates that this species has found a suitable niche in this specific habitat, fulfilling a particular role within the ecosystem.
The observation of a male Yellow-throated Vireo with enlarged testes in June in Coahuila potentially suggests what?
- The Yellow-throated Vireo is a migrant through Coahuila.
- The Yellow-throated Vireo is a winter resident in Coahuila.
- The Yellow-throated Vireo is expanding its breeding range southward.
- The Yellow-throated Vireo population is declining in Coahuila.
Correct Answer: The Yellow-throated Vireo is expanding its breeding range southward.
Correct Answer Explanation: The observation of a male Yellow-throated Vireo with enlarged testes in June, indicating breeding condition, in Coahuila potentially suggests that the species is expanding its breeding range southward. This suggests that the state is offering suitable conditions for reproduction.
What evidence suggests that the Acorn Woodpecker breeds in Coahuila?
- The observation of Acorn Woodpeckers building nests in Coahuila.
- The abundance of Acorn Woodpeckers in the oak and pine-oak belts of Coahuila.
- The presence of Acorn Woodpecker chicks in Coahuila.
- The discovery of Acorn Woodpecker eggs in Coahuila.
Correct Answer: The abundance of Acorn Woodpeckers in the oak and pine-oak belts of Coahuila.
Correct Answer Explanation: While the abundance of Acorn Woodpeckers in the oak and pine-oak belts of Coahuila doesn’t directly confirm breeding, it suggests that the species finds suitable habitat and resources in the region. This is a strong indicator of breeding activity, although further evidence would be needed to definitively confirm breeding.
The presence of Summer Tanagers with characteristics of both rubra and cooperi demonstrates the intergradation between these subspecies in Coahuila. What is the term for a gradual change in a trait over a geographic range, like the variation in the Red-shafted Flicker subspecies in Coahuila?
- Cline
- Insularity
- Disjunct distribution
- Niche
Correct Answer: Cline
Correct Answer Explanation: A cline refers to a gradual change in a trait over a geographic range. In the case of the Summer Tanager, the presence of individuals with characteristics of both rubra and cooperi highlights a cline in physical characteristics across Coahuila, indicating gradual variation between subspecies over a geographic area.
The presence of a male Black-capped Vireo with enlarged testes in May suggests what?
- The Black-capped Vireo is a migrant through Coahuila.
- The Black-capped Vireo is a winter resident in Coahuila.
- The Black-capped Vireo breeds in Coahuila.
- The Black-capped Vireo population is declining in Coahuila.
Correct Answer: The Black-capped Vireo breeds in Coahuila.
Correct Answer Explanation: The presence of a male Black-capped Vireo with enlarged testes in May, indicating breeding condition, suggests that the species breeds in Coahuila. This indicates that the state offers suitable conditions for reproduction.
The observation of a male Pigmy Nuthatch with enlarged testes in May suggests what?
- The Pigmy Nuthatch is a migrant through Coahuila.
- The Pigmy Nuthatch is a winter resident in Coahuila.
- The Pigmy Nuthatch breeds in Coahuila.
- The Pigmy Nuthatch population is declining in Coahuila.
Correct Answer: The Pigmy Nuthatch breeds in Coahuila.
Correct Answer Explanation: The observation of a male Pigmy Nuthatch with enlarged testes in May, indicating breeding condition, suggests that the species breeds in Coahuila. This suggests that the state offers suitable conditions for reproduction.
What is the term for a region with similar climate and vegetation, resulting in a distinct array of species, such as the oak and pine-oak belts of Coahuila that support the Acorn Woodpecker?
- Insularity
- Biotic Province
- Life Zone
- Niche
Correct Answer: Life Zone
Correct Answer Explanation: A life zone refers to a region with similar climate and vegetation, resulting in a distinct array of species. The oak and pine-oak belts of Coahuila, characterized by specific climatic and vegetation conditions, constitute a life zone that supports the Acorn Woodpecker and other species adapted to this environment.
The White-necked Raven is known to breed in Coahuila. What evidence supports this claim?
- The observation of White-necked Ravens with enlarged testes in May and June.
- The presence of White-necked Ravens in a variety of habitats in Coahuila.
- The observation of White-necked Ravens feeding young in Coahuila.
- The discovery of White-necked Raven nests with eggs in Coahuila.
Correct Answer: The observation of White-necked Ravens with enlarged testes in May and June.
Correct Answer Explanation: The observation of White-necked Ravens with enlarged testes in May and June, indicating breeding condition, provides direct evidence that the species breeds in Coahuila. This suggests that the state offers suitable conditions for reproduction.
What evidence suggests that the Verdin breeds in Coahuila?
- The presence of Verdins in a variety of habitats in Coahuila.
- The observation of Verdins building nests in Coahuila.
- The discovery of Verdin nests with eggs in Coahuila.
- The observation of Verdins feeding young in Coahuila.
Correct Answer: The observation of Verdins building nests in Coahuila.
Correct Answer Explanation: While the presence of Verdins in a variety of habitats in Coahuila doesn’t directly confirm breeding, the observation of Verdins building nests provides strong evidence that the species breeds in the state. Nest building is a clear indicator of breeding activity.