UnScramble this Word: u c d r e k e b?

Questions

Milk snakes lay about 13 eggs - in piles of animal ----------?

Gibbons live in family groups and communicate to others through high-pitched songs which can be heard for several miles. Songs are specific to each family and convey information such as location, temper, and social ----------?

Birds do not sing because they are happy. It is a ----------?

The ancient nautilus is considered the most intelligent of the invertebrates; it is said to have been as intelligent as a ----------?

Minnows have teeth in their ----------?