Degebian mountain goat

From Memory Alpha, the free Star Trek reference.

The Degebian mountain goat is a type of extremely agile animal, similar to a goat, known for its ability to stand on extremely narrow terrain.

After slipping off the edge of a tunnel on the edge of a crevice while retrieving the Sword of Kahless, Worf urged that Kor drop down to a ledge that was located a meter below him, which Kor could not see. After being pulled up from the edge of the crevice, Kor inspected the so-called "sufficient" ledge, and noted that it would have been sufficient "for a Degebian mountain goat, not a Klingon warrior". (DS9: "The Sword of Kahless")