What is a key? What does the key do?http://archive.fieldmuseum.org/tanzania/SkinKey_Home.asphttp://archive.fieldmuseum.org/tanzania/SkullKey_Home.asp,[explanation],List of starting points:,- General Skin Key [Sub Narrative irn 12704],- General Skull Key [Sub Narrative irn ],List of Mammal Taxonomy - Families grouped by Order; link to Taxon detail pages for Family Taxonomy records?