An introduction to the human skeletal system, explaining how the 206 bones of the skeleton join together, how they grow, how they help make blood, what happens when they break, and how they mend.
Describes the behavior and physical characteristics of the birds that live in a sub-zero climate, swim instead of fly, and send their chicks to "kindergarten.".
Discusses the physical characteristics and habits of those rodents of the far north whose periodic massive marches to the sea continue to baffle scientists looking for a reason.