Exam 20: Mammals

In mammals,estrus is the time when the animals are

In some nonruminant herbivores,such as rabbits and horses,the fermentation chamber for cellulose breakdown is a large diverticulum of the gut called the _____________.

The mammal that makes one of the longest migration to breeding areas in the Pribilof Islands is the

In contrast to birds,very few mammals make regular seasonal migrations.

The prosimians and the simians are the two major lineages of the primates.

Two characteristics that are unique to mammals are hair and mammary glands.

Mammals belong to the

If you were to examine one physical characteristic of a mammal to learn about its life style,you would look first at its ____________.

The first simian fossils appeared about 100 million years ago. Multiple Choice Questions

The largest group of mammals is the

The _____________ is a rodent that exhibits periodic great increases in their population,followed by significant declines.

Typically,mammals have two sets of teeth,a kind of dentition called _____________.

The number of orders in class Mammalia is

The ancestral primate stock split into two major lineages,one of which gave rise to _______________,which include lemurs,tarsiers,and lorises.

Mammals typically have external ears,known as _______________.

Herbivorous mammals may be classified into two groups: the browsers and grazers,and the gnawers.

In mammals the muscular structure which separates the thoracic and abdominal cavities is the ___________________.

The North American mammal that shows 10-year cycles in population density,and that is preyed upon by lynx and other predators,is the _________.

The Neanderthals belong to the genus ________________.

The scientific name of the first true human is ______________.