When they were first seen by small numbers of people, scientists refused to believe they existed. It took decades before they became official members of the animal kingdom Cryptozoologists believe that we almost certainly haven't discovered all the animals that exist in the world. They believe there must be a lot of cryptids out there that we haven't found yet. By this, they don't mean that they think that undiscovered mythical creatures like the Loch Ness Monster or bigfoot are real animals in the same way as, say,