Hmm...lemme see, lol
I used to draw a lot so studied animal anatomy...I have whelped puppies (a messy experience where sometimes nasty things present that you have to figure out)...I watch animal planet
...I have examined dead animals on hikes, in a hands off way etc.
Death
always has a story to tell and guessing what it is can make your mind work
That body is grossly bloated...it might have been half that size, alive...the fact that it's so together...nothing ate it makes me wonder if it was something unpalatable tho with nature...it has to be pretty bad to be considered unpalatable by SOMEONE...LOL.