As forelimbs, human arms, bird feathers, and bat feathers are homologous. The limbs performed the same function: as the forearms (not wings) of the last common ancestor of the Tetrapod. the bird's feather is the modified tetrapod's arm, and the bat's feather is the modified mammalian's hand.
Can bird feathers be counted as limbs?
Arms, legs, wings, flippers — these are all examples of limbs. .. There are also many large branches and limbs. In fact, when you expose yourself to potentially negative consequences to help someone else, it's called "going out to the limbs" — like crawling on a large tree branch. It's not a flipper.
Do birds have four limbs?
Birds have only four limbs: two wings, two legs. That's why they make them tetrapods.
Can wings be counted as appendages?
Insect wings are not partial appendages like legs. The paired wings arise as lateral folds of the integument, one pair above each of the last two pairs of legs.
Do birds have two limbs?
Birds are endothermic (warm-blooded), have two legs and lay eggs. The bird's digestive system is unique, with gizzards containing swallowed stones to grind food. Adaptation to flight includes lightweight skeletons and flexible bones.
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