No matter how many bizarre and fascinating animals we've seen in our lives, it's more or less impossible to say we've seen them all.
After all, even those who devote their lives to studying the world's diverse and unique creatures can still be baffled when the world reveals that something mysterious was living on it all along. After all, it's pretty hard to know anything about an animal when you're the first person in the world to see it.
In some cases, we can find ourselves completely failing to recognize what we're even looking at. But even when we know what we're looking at, we can still catch it doing something we never expected.