Zoological Related Questions

What's the plural of octopus?

Octopuses.

Do snails come out of their shells?

No.  Parts of a snail's body can move outside of the shell, but the whole animal never leaves.

What is an invertebrate?

Any animal with no vertebral column (spine).

What is a mammal?

A mammal is a vertebrate animal with hair and glands to produce milk for feeding its young.  Their middle ears include three bones--two of these were jaw bones in their reptilian ancestors.  Mammals  are also warm-blooded and have a four-chambered heart, but these traits are shared with unrelated animals (birds and theropods). The ancestors of modern mammals lived in the Triassic Period, in the early stages of the Age of Reptiles.