An animal whose body temperature stays fairly constant, no matter what the temperature of the air around it.
Fleshy appendages on the chin or throat, such as on a bird or goat.
When an young mammal no longer gets milk from its mother./A time when a young mammal gradually gets less milk from its mother as it learns to eat the solid food of an adult. Mother and offspring also spend more and more time apart from each other.
The feet of some birds, such as ducks, some mammals, such as otters, or some reptiles, such as turtles, where the toes are connected near the tips by a thin membrane of skin. This helps these animals paddle or swim through water.
An area of land set aside to shelter and protect animals.
The measurement between the tips of a bird or insect's wings when fully extended.
A small, long, thin animal with a soft body and no legs. Worms are cold-blooded and have no backbones.