World Book Online:
Basic Discovery Exercise:
1.  The mammal I chose to look up was a beaver.  The list of quick facts is age appropriate and user friendly for grade school students, and it includes the natural habitat of beavers along with other basic facts.
2.   As expected in the World Book Student section, a search for a beaver brings up additional information.  There are sections that describe the various body parts of the animal, as well as sections on the life of the beaver and how it finds food and builds a dam.  A video of a beaver and links to relevant magazine articles and web sites are included.  Also, there is a highlight material option and an audio option to listen to the text.  There is a map that depicts where the beaver lives.