This sound is from Lemmings Soundboard

A lemming is a small rodent, usually found in or near the Arctic in tundra biomes. In popular culture, a longstanding myth holds that they exhibit herd mentality and jump off cliffs, committing mass suicide.
See also: Lemmings (video game), Grizzy & the Lemmings, Arctic lemming, Lemming (disambiguation), Norway lemming, and Beringian lemming.