Cryptozoology is basically the pursuit of legends, i.e. looking for creatures like Bigfoot, the Loch Ness Monster, whatever may be a real-life basis for the mythical kewpie, etc. It's fascinating as hell, and even as filled as it is with charlatans and attention-seekers, every now and then, they fucking find something.
The creatures cryptozoologists pursue are called cryptids, and here is a list of pretty much all of them. If you've got a boring-ass job and your company's NetNanny doesn't yet block WikiPedia, you can kill a whole week at this page. Enjoy.
It kind of pisses me off that they removed the Bili Ape a.k.a. Bondo Mystery Ape a.k.a. fucking Lion-Killer Ape just because it turned out to be real. For years they only knew this gorilla-sized chimp existed because every now and then the natives would catch a glimpse of one, or else come across the remains of lions that had been beaten to death. How fucking badass is that? And they're 100% real. Sometimes it's an awesome world.