Check out Ann Leckie’s Ancillary Justice series.
For a long while you’re not actually sure what species the characters are, what their defining features are, if they even have gender, and/or how many limbs they have.
You just know what they’re like from their cutting remarks to one another.
It’s a series that focuses solely on plot and has a very loose definition of identity (and it’s awesome)
I dont get how snakes breathe
Edit: yes I do now
His lungs apparently are somehow just warping around it