Yes, Robert Strobe, a former inmate at Alcatraz, kept birds during his time there. He raised and bred canaries in his cell, which provided him with companionship and a creative outlet amidst the harsh prison environment. His passion for birds was notable, as he took care of them and even used their songs to cope with the challenges of incarceration.
Because nobody thought that any prisons would try to escape especially with the freezing waters and shark infested waters
Birds are covered in feathers
Robert Porter Keep was born in 1844.
Robert Porter Keep died in 1904.
No, birds will just land on it.
You can keep birds from getting trapped in bird netting by removing the netting or using a color of netting that the birds can see.
Possibly you meant "How do the birds keep warm . . ."? As for why they keep themselves warm, it is to stay alive.
budgies
You can keep myna birds, parrots, canary, finches, caiques, and quite a few others.
birds
If they are wild birds, keep the dog food INSIDE. they should not bother the pool, though.
Check the local hardware store for a plastic owl. This will keep birds away. No poison too.