Maybe what draws aerial predators to any prey is the fact that they are sight/movement hunters. Which is why hey can spot a mouse from great heights.
I still insist that I've read articles concerning the preference of 'camouflaged' coloring in free ranging birds helping to protect them.
https://ouroneacrefarm.com/2015/08/06/limited-free-range-chickens-12-tips-to-balance-freedom-safety
I tried to cut and paste the part about birds with mottled, speckled and whatever plumage being better camouflaged then lighter colored birds but it wouldn't let me for some reason.
I've read other articles saying what this one does plus stressing that ground cover along with the camouflaging colors of some breeds of chickens makes them safer from air borne predators.
This is an old argument that even pops up here on BYC from time to time.
So if a white bird is out under sparse groundcover, holding still and a brown black bird is nearby also holding still is a hawk more likely to pick off the white bird or the dark bird?
If the birds both move, IMHO they probably have an equal chance of being seen and picked off by the hawk. But a white bird in sparse ground cover is probably going to be more visible than the darker bird-standing out like a sore thumb as they say.
Snow geese that live in Artic are white. Canadian geese that live in woodland waterways aren't. Hmmmmmm why do you think nature gave them this adaptive coloration?