Mmm, yes, very curious, very interesting...
Some sort of Hippo? Perhaps a Hippo/Platypus cross over?
Maybe a juvenile dolphin in Halloween costume pranking the tourist?
I visited the Greek islands a few times when I was a student and after, and there are plenty of dolphins there.
My first thought was a deformed dolphin.
An opinion should be the result of thought, not a substitute for it.
- Jef Mallett
Ignorance more frequently begets confidence than does knowledge.
- Charles Darwin