Paul Fleisher 
Tundra Food Webs in Action [PDF ebook] 

Moose, lemmings, owls, wolves, bumblebees, and grizzly bears are some of the many animals that make up a tundra food web. But did you know that worms, beetles, mushrooms, and bacteria break down dead plants and animals into nutrients? Or that tundra animals depend on berries, seeds, and other plants to stay alive? See tundra food webs in action in this fascinating book.