it was based on an old ornithopter design from awhile back, but I've modified it so much, I'd almost call it an original
https://www.simpleplanes.com/a/cVtSXe/avian-ornithopter
I've had many variants and little improvements to the overall function and design, as well as alot of research as to how birds fly, I only wish I had the building skills necessary to implement the mechanics, or if it's even possible. feel free to modify/improve as you wish