I also live on Big Island (Hilo) and we see the same attrition with feral chicks around our house. We managed to catch a very young chick (probaby 2 days old) from a feral mom. We've had 'her' now for about 5 weeks. She will free range around the yard with us staying close and we can easily pick her up, place in her the coop. etc. The female feral chickens we see around the yard are often solo so we didn't worry too much about her being alone, but once she was old enough to go in the outside coop we got a little worried about her. Two weeks ago we purchased an easter egger/RIR (4 weeks old) and a silkie/cochin (1 week old). The EE/RIR had to deal with a couple of days of heavy pecking order, but they've worked it out and are doing great. The silkie/cochin is still in the house on a light but we socialize the silkie/cochin with the other two when we free range them in the yard. Feral chicken was really into the silkie/cochin's toes for the first week so we had to watch them closely. They socialize just fine now.
Feral chicken is like a velociraptor with a mission to consume skinks, huge cockroaches, and coqui frogs that the EE/RIR just blinks at. Well actually the coakroaches seem to freak her out...Maybe this velociraptor approach to food is rooster behavior? We don't know, maybe it's just wild chicken behavior? We suspect feral chicken might be a rooster but we can't tell yet other than her behavior. If she turns out to be a hen, I'll update on how well she lays...
- Peace out