Not all bats, a few species of bats, and it's technically menstration but different from "overt menstration" found in humans and primates.
Most mammals have an estrous cycle where the uterine lining is reabsorbed if pregnancy doesn't occur. If the uterine lining is destroyed instead, its menstration. Here's a paper that has an overview of the other mammals that have menstrual cycles and how they work.
Some people argue that bats are primates, but I don't know enough about taxonomy to say. I do know that there was a defining feature for primates that had to get deleted from the primate definition because we found it in bats.
https://en.m.wikipedia.org/wiki/Flying_primate_hypothesis
TL:DR : flying foxes' (those really large bats) brains are connected to their eyes in a similar way to primates, but different from all other mammals (including smaller bats). Though apparently this theory doesnt hold up when comparing the DNA from flying foxes with small bats and primates respectively.
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*Vampire detected*
That's not how it's spelt
Thanks, I hate it.
Friend of mine had bats in between his attic and the outdoor screen, used to climb a ladder to check them out.
"FUCK! They're fucking disgusting! They just piss and shit all over each other!"
Now I will think of this when listening to slayer.
Yeah. "Raining Blood" got few extra layers of meanings...
I was standing under a tree once and a drop of blood fell on my hand out of nowhere. This makes sense!
And I'm burning that hat
Finally Hunter S. Thompson's aversion to bat country has been explained.
TIL it was because of the menstruation
