Maria Birmingham  
Illustrated by: David Whamond 

Some creatures use poop as a weapon. Others count on it to communicate. And there are animals whose frass, or dung, or waste helps the planet. There are even creatures that don't go at all: a South American scorpion just discards its bum?never to poop again! From birds to bugs to mammals, When Nature Calls draws on scientific research to show readers the role poop plays in the animal world.