"Large rodent, big teeth. They use them to chop down trees and build dams. Very industrious."
Meredith Rodney McKay[src]

A Beaver is a large rodent found on Earth. Rodney McKay was a member of the Fort McMurray Eager Beavers when he was younger, a scouting organization in which the members referred to themselves as 'Beavers'. (SGA: "Tracker")