Lol from Wikipedia, "Chick sexing is the method of distinguishing the sex of chickens and other hatchlings." For further context, this is done by a highly trained individual who is able to briefly look at the cloaca of a chick and immediately recognize their sex. They are even known to be able to perform this on two chicks at the same time (one in each hand). Joshua Foer briefly talks about it in his book Moonwalking with Einstein where he attributes the skill to the incredible ability of humans to perform rote memorization. I think it is better understood as an example of the incredible abilities of these sorts of neural networks (digital and biological) for pattern identification.