Nessie all the way. That's one reason why I've never, and don't even know how to swim. I'd be completely aquafobic if it weren't for the fact that i love getting all wet and muddy in the rain. And because the other ones are completely unbelievable, and I would never believe in either of them if my life depended on it.
bigfoot, he could just be an ancestor of an ape or soemthing and a speicews we didnt find yet. chupacabra, just a dog/fox sucking on goats blood lockness is just a stick stinking out of somelake, if people wanted to find it they could just use sonar, and find the thing.