At first glance, Davi, a small Brahma chicken, might not seem like a controversial figure. She pecks around in the yard, gives herself dust baths and clucks ever so quietly. There’s just one problem: Davi and several other chickens are pretty much outlaws. Chattanooga city ordinance bans livestock on any lot smaller than five acres. But in coming months, that hen, and a dozen others owned by a Missionary Ridge family, may be the topic of discussion for the Chattanooga City Council.