Bosses can appear anywhere in any part of the game world. In our world they are mutations from the chimera infection, they ALL have at least 1 skill that can be learned.
Cheep-Cheep – Bulldog parakeet (sheet)
Pussyfoot – Bald Cat spider
Slitherine – Snake insect
Baconator – Potbelly pig
WanderingSlew – Plant Vines
Blob – Compiled corpses