The Fascinating Journey of Chick's Hatching Process
Development of the egg starts with incubation, leading to chicks hatching within a day or two of each other despite being laid over a period of two weeks. The hen can hear the chicks peeping inside the eggs and gently clucks to stimulate them to break out of their shells. The chick pips to create a hole, absorbs egg yolk, and eventually emerges from the shell to dry in the warmth of the nest.
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Presentation Transcript
Development of the egg starts only when incubation begins, so they all hatch within a day or two of each other, despite perhaps being laid over a period of two weeks or so. Before hatching, the hen can hear the chicks peeping inside the eggs, and will gently cluck to stimulate them to break out of their shells. The chick begins by "pipping"; pecking a breathing hole with its egg tooth towards the blunt end of the egg, usually on the upper side. The chick will then rest for some hours, absorbing the remaining egg yolk and withdrawing the blood supply from the membrane beneath the shell (used earlier for breathing through the shell). It then enlarges the hole, gradually turning round as it goes, and eventually severing the blunt end of the shell completely to make a lid. It crawls out of the remaining shell, and its wet down dries out in the warmth of the nest.
