posted 7 years ago
My first guess would be coyote. A smaller canine (e.g. fox) would be more likely to leave feathers, as there would be more of a struggle. We lose all sorts of birds to coyotes, no matter the time of day. They are generally more active early and late, but I had one take a duck off the pond at about 1 pm this past summer. At any rate, they rarely leave feathers. They're canny critters.
Domestic dogs tend to kill and leave the carcasses lying about. And they kill more than one. Then again, the domestic dogs I've had to deal with were free roaming, but not, I think, actually feral. A feral (read: hunting) dog might behave more like a coyote, but that's just conjecture.
It seems that raptor attacks always leave feathers at the point of impact. One possible exception might be a large bird like an eagle. With red-tailed hawks, they'll tend to kill and eat on the spot. If they want to move, they might fly off a short ways, but I've seen this take multiple attempts to move the carcass any appreciable distance, with feathers thus dispersed. My only known (successful) owl attacks have occurred at night, with a chicken roosting out in the open. The result, found the next morning, is a headless chicken. Although, I once had an owl attempt to take a chicken, swooping down perhaps 10 feet behind me while I sat and waited for them to return to their pasture shelter at dusk, so they aren't strictly nocturnal in that sense. In any case, birds of prey seem to leave ample evidence.
I would rule out a domestic cat. Not that a cat couldn't kill a chicken, but certainly there'd be feathers. I'm not sure about bobcats, if they're even a possibility.
Chris makes some good points, but in my experience predation isn't necessarily linked to limited availability of other prey species, but to opportunity. A coyote's diet, for example, might generally lean heavily on cottontail rabbits, but domestic poultry tend to be much easier quarry. I've even noted, seemingly ironically, that early fall, when squirrels and rabbits are at their most abundant and with fewer leaves on trees and brush to make them easier to see, is when we experience the height of hawk predation for the year.