This chicken has suddenly started visiting our flock. We don't know where she comes from, or where she goes at night. She comes in the morning and hangs around our chickens when we let them out. She even sneaks into our coop sometimes when the other chickens are all out, but some oour flock will chase her if she gets too friendly. We think she must be an escapee or survivor from another flock, but we don't know from where. We asked the only person we know of with chickens nearby, and it's not hers. So we call her Ishi. She's all black like an Australorp, but smaller, and with a rose (or pea?) comb, and a few feathers on her legs.