From National Geographic Kids
North American Beaver
Includes facts and a coloring and labeling printout
Interactive beaver coloring page
From Enchanted learning
Library of Fur Trade Historical Source Documents
First hand or primary source diaries, narratives, and letters written by Mountain Men.
Beavers: Wetlands and Wildlife has lots of info, a few good pictures, and a FAQ that will answer kids' questions.
A kid-friendly page with beaver info