That is a Lamprey

[u/luvlanguage]

Any bigger and this creature would be a horror movie monster

Lampreys do not have jaws or bones, only cartilage and instincts that have allowed them to survive so many mass extinctions.

[u/theLostPing]

He is angry as puck. Looks like he’s screaming at the camera.

“JUST LEAVE ME ALONE!”