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Which came first, the chicken or the egg? Is that one of those deep philosophical questions which has no answer? It turns out that it has a relatively simple answer. The egg came first, sort of.
Apparently nature did not create the chicken. Chickens are probably the result of selective breeding by humans. According to encyclopedias, chickens are probably descended from a jungle bird in south-west Asia. Jungle bird gradually transformed into chicken, without a sharp dividing line. So, it is hard to say when one of the birds was a chicken. Each mother (and father) would be essentially the same species as the chick. But the chick would often be different, with more chicken-like features which the breeders were selecting (intentionally or accidentally). And if you can imagine a time when the vague line between non-chicken and chicken was crossed, then there was a first chicken. A not-quite-a-chicken gave birth to a chicken. And that chicken started out as an egg.