Exam 21: Birds: Reptiles by Another Name

The voice box of birds is called the

The archosaur lineage that includes birds and dinosaurs also includes the

In __________ birds,the male mates with more than one female and the female provides most of the care of the eggs and the chicks.

The __________ of most birds has a large,medial keel for attachment of flight muscles.

Which of the following is NOT a characteristic shared by reptiles and birds?

Contour feathers consist of a __________ with inner and outer webs.

In birds and reptiles,the excretion of __________ conserves water.

When birds fly,increased muscular activity produces large amounts of heat.Excess heat can be dissipated by

Reduction of turbulence over the wing surface is accomplished by slotting of feathers at the wing tip and by the __________,a small group of feathers supported by the bones of the second digit.

Some birds are helpless at hatching and are entirely dependent on their parents.Hatchlings of this type are said to be

All birds undergo a periodic replacement of their feathers during

The __________ of the stomach region of birds is called the gizzard.

Evidence seems to indicate that the feathered fossil form known as __________ was a glider rather than using flapping flight.

The traditional classification system places birds in the class

Birds,dinosaurs,and crocodilians are all

The brain of a bird has a region called the __________,that regulates heart and respiratory rates.

In many birds,a diverticulum of the esophagus,the __________,can be used to store large quantities of food.

Birds regulate their body temperatures at approximately

The eyes of some birds have two focal points or __________ per eye.

The structure that produces "pigeon's milk" is the