It looks like a primative cat.  It moves like a squirrel.  It has the ferocity of a bobcat.  It's the adorable but deadly Fossa.  Dangerous Creatures: Fossa introduces you to this strange real world animal and gives you everything you need to introduce it to your game.  This compact PDF presents the creature write up for both the Fossa and the Greater Fossa.  You also get rules for introducing the Fossa as an animal companion or familiar.  Plus variant stat blocks for celestial and fiendish variants of both versions of the Fossa, as well as skeleton and ghost variants for the Greater Fossa.  All of that crammed into a neat little package for only $1.00!