An armadillo (Dasypus novem).
The armadillo is a small terrestrial animal native to the planet Earth. The armadillo is an quadrapedal insectivore with a snout, tail, claws, and a thick casing of armor for defense.
Eli Hollander once asked Worf if his strange looks were the result of his mother having married an armadillo. (TNG: "A Fistful of Datas")
When Uhura tried to match the sound of the whale probe to the sound of an Earth animal aboard the Klingon Bird-of-Prey HMS Bounty, a Long-nosed armadillo (Dasypus novem cinctus) was one of the animals shown. (Star Trek IV: The Voyage Home)