Biology field guide
Wings, limbs and support structures built for different movement
A body part that looks oversized often reflects the force it handles. Wings, legs and claws show how movement depends on habitat, speed, body mass and the surface beneath the animal.
Animals in this guide
6 connected profiles
Bird
California condor
A featherless head is practical for a bird that reaches into carcasses. Exposed skin is easier to clean than blood-soaked feathers and can change colour during excitement.
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Mammal
Angolan free-tailed bat
Long narrow wings trade tight turning for efficient fast flight. The exposed tail and broad tail membrane help control pursuit of flying insects.
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Mammal
Hammer-headed bat
The male's head is part of an acoustic system. Enlarged air passages, larynx and lips help turn a call into the far-carrying honk heard at display sites.
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Bird
Dong Tao chicken
The legs are not ordinary chicken legs hidden by feathers. Anatomical study found an exceptionally thick tarsometatarsal bone and enlarged connected regions.
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Mammal
Giant anteater
Claws break the nest, smell locates the insects and a saliva-coated tongue enters narrow chambers. The long skull is a housing for specialised feeding equipment.
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Amphibian
Purple frog
A compact body and reinforced limbs push through soil, while the narrow snout helps the frog work around underground feeding spaces.
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How can two wings solve different flight problems?
California condors use very broad wings to soar on rising air and travel widely with limited flapping. Angolan free-tailed bats use long, narrow wings for fast, efficient open-air flight.
Hammer-headed bats have a different ecological and social system again. Wing shape should be compared with body size, feeding behaviour and the space in which the animal flies.
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What do thick legs and large claws reveal?
Dong Tao chickens have unusually thick lower-leg bones and associated tissues. Giant anteater claws produce force when opening nests, while purple frog limbs push against soil.
Visible size alone does not prove a purpose. Anatomy can describe what is enlarged, while function needs evidence from movement, behaviour, breeding history and mechanical demands.
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