This story is about chickens alias Gallus gallus domesticus. For those who are seeking for an answer what was first – egg or a chicken? Every programmer can answer you this simple question. The answer is – a chicken without an egg. OK, back to gallus gallus domesticus. It is domesticated bird misused by humans for eggs and meat. Chickens are omnivores which eat seeds or even very small animals and insects. Incubation period of eggs is about 21 days and after it we can see such cute hatchings.