I was doing some digging, and initially found the part in the ordinance that says "1 animal unit per acre" and took that to mean one chicken per acre. Upon further digging, in the index, it gave a definition of what an animal unit is. Breaks down like this... 6 chickens 4 turkeys .5 horse .5 cow 1 pig 2 sheep They base it on how much poo they create. Funny! So if you can't find clear definitions, check the index! I've about read the whole thing now, to be sure I've seen everything animal related, and fence related.