Birds Regulate Their Body Temperatures at Approximately
A)15 ^$\circ$
B)31 ^$\circ$

Q13: Evidence seems to indicate that the feathered

Q14: The traditional classification system places birds in

Q15: Birds,dinosaurs,and crocodilians are all<br>A)pterodactyls.<br>B)saurentians.<br>C)pterosaurs.<br>D)archosaurs.<br>E)plesiodactyls.

Q16: The brain of a bird has a

Q17: In many birds,a diverticulum of the esophagus,the

Q19: The eyes of some birds have two

Q20: The structure that produces "pigeon's milk" is

Q21: The activity by which birds maintain a

Q22: The _,or "wishbone," of a bird is

Q23: Which of the following features of birds