You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.

Category: COLLEGE SPORTS TEAM NICKNAMES 
Clue: Penn State
nittany lions

Category: THE CIVIL WAR 
Clue: His first act after being sworn in as president of the Confederacy was to send a peace commission to Washington, D.C.
jefferson davis

Category: THE NATIONAL PARK SYSTEM 
Clue: A Montana park is named for these formations you'll also find in Washington's Olympic & North Cascades Parks

glaciers