Niffler

A niffler is a treasure-hunting creature resembling a porcupine with a long narrow snout. They are very attracted to shiny things, which makes the wonderful for locating anything metallic or shimmery, but they might bite if you're wearing jewelry. Considering that these are among the creatures selected by Hagrid for study, they're actually quite cuddly. Ron mentions that he would like one for a pet - but beware: nifflers wreck houses!