The Bunnycorn is a new super-cute crystal critter that you can get from the Jaguar Temple. It looks like a bunny rabbit with a unicorn horn.
First you go to The Explorer's Camp to enter the Jaguar Temple (you have to have the levitation and invisibility powers).
After you entered the Jaguar Temple you levitate to all of the different plateaus to collect the five Blue Crystals for the first time.
When you have all of the Blue Crystals you will get a crystal Bunnycorn.
NOTE: Kan the Geomancer in The Explorer's Camp can reanimate the critter for you.
NOTE: Make sure to feed it a cake emote every once and a while!