Literally Satan, kill it before it steals all your items your children and your dog. I don't care if it's good for gathering fish, I need a genocide of these guys after they stole my mastercraft crossbow and pick.
I was attacked by one while mining flint and it stole my pick. Then it got my pike when I went to fight. That's when I noticed noticed that it didn't actually "steal" what was in my hand, but just disarmed me and dropped it in the ground. Check the ground and see if your stuff is there after they attack you. My pick was laying there near the spot of the initial attack.