Chickens are a gateway animal. Before you know it you will have goats, ducks and turkeys.
Yeah...there's already talk of goats.
I worked as a goatherd for about 2.5 years here in Atlanta. They are amazing animals. Smart as hell too.
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My grandmother kept goats. I didn't have to cut grass in her yard. One time she had a little billy and he wouldn't butt anyone but me and my red bone hound. That little bastard would wait in ambush for either of us. He would butt me in the hip or butt. After a couple months of this I carried a softball bat in the yard. The first time he came at me and just as he launched himself at me I turned around and when he lowered his head I caught him right on his horns. He lay there stunned for a minute, got up stunned, shook his head a few times and wandered off. That was the last time he ever tried to butt me. He still went after the dog though until my grandmother sold him.
Goats will head butt like crazy, but mostly each other. I only got butted twice in 2.5 years. One was a buck the guy kept for breeding. Not that big, but he was coming off the porch of an abandoned house and hit me in the chest. I went down like a ton of bricks. The other was the biggest goat I've seen. Not a hard butt. He was just trying to be the boss. I grabbed him by the ears (horns had been removed) and butted him back to show him I was bigger. Glad he decided not to fight.
There is a YouTube video of a goat and a cow ramming each other full force. Both went down, but the goat was up a lot quicker than the cow.