Exam 19: Birds

The raptors,such as hawks and eagles,are notable in their well-developed senses of smell and taste.

Most species of birds tend to be nonsocial.

The digestive system contributes to the success of birds as flying animals because

The photoreceptors in the retina that are more numerous in nocturnal birds are the ________.

In birds,reproductive organs of both sexes shrink to vestigal structures during the nonbreeding season.

Flightless birds

The high-speed wings of plovers and sandpipers have swept-back wings that come to a tip,an adaptation that reduces drag-creating turbulence called ____________.

The muscle which raises the wing of a bird is located

Birds typically molt their feathers in the fall,right before migration.

Most of the birds that migrate breed in the more southern latitudes of the Earth.

The enlargement at the lower end of the esophagus that serves as a food storage chamber in birds is called the ___________.

The bird that makes the longest known migrations of any bird,between the Arctic and the Antarctic,is the _____________.