Ive seen a lot of people recommending yoghurt and even milk for chickens here, and even pictures of chickens enjoying devouring these dairy products. I was just wondering though, how do birds manage to digest milk, and specifically the lactose in the milk? Mammals are born with plenty of enzyme in our digestive systems to digest lots of our mothers milk when growing as an infant. But we start to lose this ability as we get older, so most adult humans are lactose intolerant to some degree, as we dont have enough enzyme to digest the lactose. Mammals like us get stomach cramps then expel the contents of our stomachs through violent diarrhea. You can observe this on animals like pet cats, you cant feed an adult cat much cows milk without getting problems. So what happens with chickens? An animal which has absolutely no biological reason to be able to digest milk. If you feed a chicken dairy does it it actually gain any nutrients from it? If so, how does a chicken manage when many of us mammals would struggle to?