A few years back I participated in an art challenge called creatuanary where you post a drawing of a creature each day of the month of January. Out of that came the popular Norse Beastiary that sold out of 2 print runs in just a few months. (thank you to everyone who got a copy!)
I've been meaning to participate again but last January got away from me. This year though I've put together a great list of Cryptids that I want to draw, so I'll be posting them on my social media.
Some of them could be fun creatures for your OSR game, so here is the Ahool with stats.
AC: 16 
Atk: 2 claws (1d4x2), 1 bite (1d6)
Move: 12" flight, 3" crawl
Special: piercing shriek, save or be deafened for 2d8 rounds. Pick up and drop.
The Ahool (or Athol as it is called by some) is a flying primate with bat-like wings. Their name comes from its loud distinct cry; "AHOOooooOL!".
Ahool live in the deep jungles, and can be found across tropical and sub-tropical climates. They have a distinct face that has features of both a spider monkey and a bat's, with large dark eyes, red-orange skinned wings, large claws on its forearms, and covered in grey fur. They have a wingspan of 18 to 28 feet (6 to 9 meters). They mainly eat local fauna; such as large fish, they will occasionally attack humans. Most likely because they're extremely territorial and opportunist and will attack larger prey under the right circumstances.
In combat they will start with their blood curdling shriek. Then they can pick up a medium sized or smaller creature, lift it up to 100' in the air and drop it. As a last resort they will engage in melee attempting to claw and subdue potential prey.