What on Earth is that on the main menu screen?

https://preview.redd.it/hudtwiohyprh1.png?width=1920&format=png&auto=webp&s=ca9d921ddfd11266a421e319fe2c09a9d87e0669

Dont mind my nude character, I died before closing the game.

But if we zoom in on this screen we can see...

https://preview.redd.it/4fz9myluyprh1.png?width=584&format=png&auto=webp&s=54255162a3a46bb1e2ce5fc5132fea415902029f

some abyssial sea lion emoji creature.

Is this a new mob from 1.0?