I will have to agree more with Jeanne on the bald eagles. I have watched them come in and carry off live hens when I was running free range layers. Lost 123 that year and that is when I finally gave up free range layers. I know a few were gotten by the fox that had a den but I made sure that they were let out later in the morning and locked up in the evenings and that stopped. I watched them come in and swope down and pick up hens several times. The Eagle actually dropped hens 2 different times in a neighbors yard and came back to grab it back up. They took pictures to prove to me that it really was an eagle.
I also had a young immature eagle hanging with a group of the black buzzards for about a month when I was running the layers, and the first calf heifers were calving. I spent HOURS up there at pasture when they were calving. The eagle challenged me when I went to go into the converted trailer- made into a mobile laying coop- and it had a chicken dead on the ground eating it. Thinking at first it was a buzzard, I went to chase it off, and then when I got close, realized it was not a buzzard but a young eagle. It spread it's wings at me and dared me to try to take away it's meal. The chicken was already dead. I did not have my .22 or it would have been SSS. I'm not saying it would have gone after the newborn calves, but I honestly would not have been surprised. They are so hated in this western part of Va., they are called "white headed buzzards" by many. They have been seen getting baby lambs in Highland county, they hate the eagles out there.
I realize they all have to eat, and I did not begrudge an occasional chicken killed, but to systematically take one nearly everyday, was just too much. They are opportunists, just like the buzzards. There are not much as far as bodies of water that would support a population of eagles, but they are nesting in this area and have adapted to not relying on fish but to take other small animals.
Yes, buzzards do have a highly developed sense of smell. I believe they are the only bird that does.