Sissy's chickens

My husbands niece has lived all her life in the city of Sacramento.
She called me about my daughter dying and told me she was working at the city dump driving a bull dozier. She has a flock of about 70 birds that lives just out side the fence where the equipment is parked. She feeds the chickens corn and they get the rest of their feed from the land.
Sissy also has a flock of pigeons that try to get some of the corn. She said she didn't know where the first chickens came from. They just arrived one day and decided this was a good place to live.