|Day uhhhh 5?|
A great insect, constantly growing, constantly molting, possessed of no skin nor really a hawk. Their ragged, papery "fleshes" look leafy and spectral in flight, and when they molt they leave behind skins that hang in trees and tangle in carriage wheels. They're also known as corpse moths and gypsy tanners.
The begin as eggs which start out as small as a frog's but grows to the size of a Kender egg. Their hatchlings are nymphs looking like small, already folding and hollowing, slightly batlike humanoids. They're about as big as an old school Cobra Commander toy. They begin shedding quickly, doubling in size about once a week. Some of their skins are more grotesque than others, and some of these early skins are mistaken for goblins, fairies, or even dwarfkin.
Where this becomes your problem is that skinhawks work like botflies, landing and impregnating you with multiple eggs (d20) in the point of contact. These mature within a week and if allowed to fully mature and hatch fully destroy whatever area of the body they're in. The area will take on the papery, cracking texture of the creatures themselves, flaking away in sheets until the eggs are exposed and hatch, leaving big holes and shell fragments embedded with hooked barbs. When infested, you need a druid or ranger to handle the extraction surgery, not a cleric or chirurgeon. If you can't find one, a short-term remedy is to remove your normal clothing and wear the skin of a skinhawk next to your skin, "tricking" the egg into thinking it's still inside of a parent.
Skinhawks are seahorses, see: the males die quickly and their only purpose in life is to meet a female, receive eggs, fertilize them, and distribute them. Females are rare and live a lot longer, growing truly enormous and monstrous. Some of their forms are mistaken for dragon skins, or giants, or worse...once they exceed ogre size they can't even fly, they just billow across the land like a crawling, empty-eyed bed sheet. They see in the dark and love caves and canyon groves for their roosting places.
Female skinhawk husk is prized as an aphrodisiac, ground up and snorted.