Cryptids are animal/insect like creatures with some super natural elements. Jay Stephens compares cryptids to the mutants in the Marvel Comics universe; unique individual species within the animal kingdom. Although in real life, cryptid would refer to any animal whose existence is disputed, like Bigfoot or the Loch Ness Monster.
Link to all Cryptids involved with the series: Category:Cryptid
Examples of some "Real Life" Cryptids