Bats have it Spoiler: Bat and birds have it too Spoiler: Duck For a bat, its called a "thumb" because it is an extension of their "hands" and on birds, its called a "wing spur" and remnants of dinosaur heritage. I figure "wing spur" would fit your need better than "thumb"
Yeah, I googled bats but didn't like the name "thumb". I had no idea birds have it too, that's cool. "Wing spur" definately has possibilities. Thanks!
“A Dragopterybat! Why, don't you know? He has terrible beard spikes, and terrible (hot) breath, and terrible witchy-fingered wing-fold claws to haul his terrible heft.” said the mouse. ^ tenuous
I had no idea either. Found out by accident when i was making my first thanksgiving dinner away from home and the little chicken i used (turkey was too big for 2 people) had "claws"! It freaked me out. Went to google to look up my mutant chicken, and found that its common. A lot of birds have it.