genus
- Biology. the usual major subdivision of a family or subfamily in the classification of organisms, usually consisting of more than one species.
- Logic. a class or group of individuals, or of species of individuals.
- a kind; sort; class.
I know what they are.
Them being aqutic, different or whatever really doesn't matter.
We are to guess what they are according to how they look.
Snow weasels and minks have very similar facial features.
If I could see the tip of its tail, I'd be able to answer it right away.