Grue

A grue (Gruesomicius ravenousi) is a box-shaped gap-toothed mammal known for eating humans, though more recently they have been known to kill certain lone wolves, construction workers, a gerbil or two, speranah, the occasional monkey, people who send annoying chain e-mails, your pets, and...well, Grues like eating a lot of things.

What Should I Do If I See an Grue?
Call Bill's friend The Crazy Bill Guy. The Grue will kill itself.

Summon the Super Grue. Althought, he will eat you but you killed a grue.

Put a child in the way. That will give you 20 more seconds.