Hatching process
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The hatching process is the independent liberation of an animal, usually an oviparous young animal or a larva , from an egg . Even in insects , which after the metamorphosis of the doll free, it is called "hatching".
For this purpose, in birds and reptiles, the shell of the egg is first made to tear from the inside by applying strong punctual pressure with the egg tooth . Further pressure will widen the crack into the hole, which will expand until the young can peel out of the egg.
The liberation from the egg with your own strength is very energy-consuming. The process therefore often takes several hours. The hatching animals have to take breaks again and again in order to regenerate. In some animal species, the first hatched boy supports his siblings from the outside; in others the young get rid of the competition by trying to push eggs that are still closed out of the nest.
If chicks are hatched by a mother hen in a nest, the brooding chicken will then, when some animals have hatched, help the rest of them with pecking the beak when blowing up the shell, because later on they will always have to hold the chicks together and not on the remaining eggs can remain. If hatching takes place in an incubator , the chicks are more on their own when they hatch .
Examples
Hatching process in a Greek tortoise ( Testudo hermanni ):
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Hatching process of a blue-green damsel ( Aeshna cyanea ):
Web links
- A chick hatches on huehner-info.de
- Chick hatch in the artificial brood on huehner-haltung.de