Bird, animal with feathers and wings. Birds are the only animals with feathers, although some other animals, such as insects and bats, also have wings. Nearly all birds can fly, and even flightless birds, such as ostriches and penguins, evolved from flying ancestors.
Cat, small, mainly carnivorous animal, Felis catus, member of the family Felidae, popular as a household pet, and valuable for killing mice and rats.
Dog group of intelligent, carnivorous mammals that includes domestic dogs and their relatives, coyotes, wolves, foxes, jackals, dholes, raccoon dogs, and bush dogs. The dog family is known scientifically as Canidae, and its members are commonly called canids.
Ferret small mammal belonging to the weasel family, having a long, slim body with short legs. The two kinds of ferrets are the domestic ferret and the black-footed ferret. When frightened, both types discharge a strong-smelling secretion from scent glands under the tail.
Fish, diverse group of animals that live and breathe in water. All fishes are vertebrates (animals with backbones) with gills for breathing. Most fish have fins for swimming, scales for protection, and a streamlined body for moving easily through the water.
Horse, large land mammal notable for its speed, strength, and endurance. Horses are members of the Equidae family, which also includes zebras and asses.
Small Animal Rodent, any mammal characterized by a pair of broad, sharp-edged, chisel-like incisor teeth that are firmly inserted in both jaws and are used in gnawing vegetation. The front surface of each incisor tooth is composed of enamel, and the hind surface is of soft dentine, which wears away during the process of gnawing so that the teeth are constantly kept sharp.
Reptile, animal with tough, dry skin covered with horny scales. Some of the most widespread living reptiles are turtles, lizards, snakes, crocodiles, and alligators.
Descriptions are from Encarta.com