Former Cryptids are cryptids that have been scientificaly proven to exist
When we think of cryptozoology, we usually think of Bigfoot, the Yeti, and the Loch Ness Monster, creatures that are - let's face it - probably legendary. But some cryptids are real: just ask the platypus, okapi, and giant squid.
Of course, all of those are cryptids - they've since been "officially" discovered. But the fact is that all these creatures were not so long ago considered the stuff of myths and hoaxes by serious zoologists, and that something like the platypus was considered just as unlikely as Sasquatch. These are all real creatures that, at least for a moment, blurred the line between zoology and cryptozoology.