Its a slug!!
that is just grooooss
I was like wait that must be an abstract drawing, than I saw the title and the listing of it being a photo and though no f-ing away, than went to its page proper and thought hmmm slug. If not above glass that was above you sorry to be you when it landed on ya to suck out your brains or whatever and if on glass good job not having any glare or reflection
at first look a flying squirrel (i don't know the english name but you'll know which i mean) - super picture...
Is it on glass?
I don't know why, but this picture made me so happy c: