Well if you went through the content under the link that 'Chick' gave , you might wanna go through this as well. This could give you more of a detailed view in a nutshell. If you are into this Cryptids subject so bad, you might have hit the mother-lode. It give you tons regarding Cryptids.
One Stop Shop!!!
https://en.wikipedia.org/wiki/Rhinoceros_dolphin
The below link might give you actual facts though:
http://listverse.com/2010/08/13/top-10-cryptids-that-turned-out-to-be-real/