Traits

Bigger paws then usual

Paws with more fur then usual

Only Ribinas in Arias Peak have this trait

Extra fur/fluff on the legs

Only Ribinas in Evoca Shoal and Louse Morass have this trait

Paws with webbing 

Only Ribinas in Evoca Shoal have this trait

Fins on the legs

The claw is clearly visible and has a distinct claw shape. It is thicker and has a bony structure.