Gnawties are beaver-like enemies in the Donkey Kong series. They made their first appearance in Donkey Kong Country, but they have made minor appearances since their debut, such as in Donkey Kong 64.
There have been several enemies in the DK series that have very similar characteristics to them, such as the Neeks. They can be defeated easily, from the classic method of jumping on their head to using any type of barrel to the usage of Animal Buddies.
However, their sub-specie Millstone Gnawty is considered the toughest enemy in DKC, due to being invincible and far larger than a Mincer.
There is a larger boss version called Very Gnawty, as well as Really Gnawty, which can be defeated by jumping on their head. Gnawties appear in different colors, though there isn't any difference between the alternate colors. They are usually a lime-ish green color and resemble a beaver. ]