why the coil lay eggs on the crow nest
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because they have not their own nest
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The Cuckoo is mainly a Frugivorous creature. Which means that the diet of adult Cuckoos mostly comprises of Fruits. Baby birds require huge amounts of protein rich diet to grow quickly and healthily. This is true for all baby birds, including the Cuckoo. However, the dietary habit of the Cuckoo is in complete contradiction to the requirements of its babies. This dietary duality in the life cycle of the Cuckoo is considered to be the biggest contributor to its Brood Parasitic nature.
A female Cuckoo lays it’s eggs (in a hurry) in the nests of other birds like Crows, Drongos and sometimes even much smaller birds like Bee Eaters. To do this, the mother Cuckoo destroys one or two eggs of the host parent bird and replaces it with her egg. This cuckoo egg has a thicker and stronger shell, evolved to withstand getting cracked during the egg dropping raid. Also, thanks to it’s specific evolution, the Cuckoo egg hatches much faster than other bird eggs.
Instinctively, the Cuckoo baby (which is much larger than the eggs/hatch-lings of the host parent bird) chirp almost continuously, driving their host parents to feed them protein rich (non-vegetarian) food with much more urgency and volume. The hatch-lings also destroy the eggs and/or hatchlings of its host parent to maximise the attention it can get from the host parent.
All of this behaviour has no relation to laziness, negativity or evil. Neither can one compare the behaviour of the host parent to love, generosity, positive or good. It is simply survival of the fittest and instincts.
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