I'm so sorry you lost some!Over the past 3 weeks, we lost 2 hens.
We believe the first one succumbed to the 90+ degree high temps that were going on at the time and was subsequently cannibalized. She was a coronation Sussex and absolutely a humongous bird. That was a very disturbing find! RIP Gloria.
Two weeks later, one of our hens' body had been dragged out from under the coop gate but she was a Delaware and too big to get through the yard fencing. We have iron yard fence with bars every 3-ish inches. The predator appears to have repeatedly tried to pull her through the bars, but only succeeded in 'plucking' her chest. Oh, yes, and her head was missing-YIKES! We're theorizing that the predator was a fox, but I was wishing I had kept @Mother2Hens pages of predator evidence she posts every now and again. RIP Barbra.
We have since reinforced the gate area, but doggone it, Barbra was just the sweetest hen. At Easter time, we'd bring her in the house and she loved to have people hold and pet her. We miss them both.
Both our losses were white birds, and now we no longer have anybody white. Perhaps predator-wise, white hens are at greater risk, but we loved being able to see the hens pecking from the house, and the surviving birds are all brown, black, or barred. Much harder to see.
Here is a link to one of the predator articles in the Learning Center. It pretty much describes what kind of attacks you get from different predators. Maybe it will be similar to Mother2hens list.
https://www.backyardchickens.com/articles/a-few-tips-on-some-common-predators.64481/
and now I just need to figure out names 
