Cetaceans:

Which of the following was not a hypothesized function of early feathers?

Tubenoses get their name because:

The uncinate processes:

Which birds are similar to penguins and only found in the northern hemisphere?

Beaks are made of

Match the reptile group to the example

Which gland is closely associated with hair follicles?

Snakes and Crocodilians have ________________ salt glands and drink __________________

Which bone acts like a spring for flight?