Hawks

Yes, but mainly young geese.Adults are too powerful an adversary.

Authentic bird's nest soup is made using the nests of the swiftlet, a tiny bird in southeast Asia. The swiftlet lives in dark caves. Instead of twigs and straw, the swiftlet makes its nest from strands of its own gummy saliva, which hardens when exposed to air.

Hopefully, a red tailed hawk would not be kept captive. They need to be free with plenty of forest and meadows to hunt in.

If you took the hawk out of the food chain, the animals that the hawk preys on would become over populated. This would mean that the animals and plants that the hawk's prey eats, would be used up. The prey animals such as the Blue bird would begin to go hungry. The delicate balance of nature would be thrown off.

they have red shoulders and a red tail

i believe they're white with little dots

What I have seen, in Missouri is that farmers and ranchers think they are bad, and shoot them illegally. In addition, I highly believe that man has pushed them into areas each time less and less good for their survival, no field mice, etc.

Take away their nesting areas, hunting grounds, and what do you expect, numbers will be reduced.

Also pesticides and other chemical agents do effect them, harm their eggs as DDT did to eagles.

Scavengers are normally carnivores (and sometimes omnivores) who are some where in the upper parts of the food chain, but not quite at the top.

They have to rely on an apex predator hunting and making a kill, they will then eat what is left over.

Typical scavenger carnivores include hyena and vultures.

No they don't as they are carnivorous, meaning they only eat other animals