I like to think there's a bit of truth in a whole lot of things. Surely between fish/reptiles learning to walk and live on land and human creation there were creatures resembling mermaids and the like. Look at the Duckbill Platypus for ****'s sake.

And i don't care what anybody says--I've watched a lot totally denying this--I still think faeries are real. Ghosts/spirits are, why not them?