That is a really cool wildlife experience to have!
I volunteered at a wildlife rehab center where I got to feed a Peregrine falcon, red tail and red shoulder, and Cooper's hawks, golden and bald eagles, American Kestrel, Great Horned, Barn, and Screech owls. Even got to have a bobcat cub climb...
Well, if they are vultures, they don't eat live food. I can usually see yellow beaks on the vultures here. Don't remember white wing tips though. That is kind of eerie!
I see lots of migrating birds including haws at certain times of year.
I can't blame your birds for being upset! I probably...