Bulls are strong, muscular, mature male cows.

Dolphins are highly intelligent and social marine mammals.

Guinea pigs are gentle, curious pets.

Hamsters are desert-dwelling rodents who have become popular pets.

Large-eyed, long-tailed lemurs are complex primates who belong exclusively in Madagascar.

Mice and rats are curious, social animals who can make excellent pets.

These shy, gentle animals share our neighborhoods—and sometimes our homes.