Yes. Many wild birds eat fruit.
sometimes they will
yes
poo
Yes many birds in the wild life eat each other
Nearly all domesticated birds do, but some wild birds eat berries and other things.
yes,many songbirds eat them.
Yes, wild birds can eat cranberries. Just last week, I put out some on my feeder and on the floor, and some birds eat it, and the squirrels and chipmunks all gobble up the rest on the floor.
yes
Yes
some do
Birds of prey, Kestrals for example, wild cats, fox.