The bird lays her eggs, online poker software, the cockou eats them.

The cockou bird is a brood parasite. Online poker software, They lay their eggs in the nests of other birds.The best-known example is the European Common Cuckoo. Online poker software, The cuckoo egg hatches earlier than the host’s, online poker software, and the cuckoo chick grows faster; in most cases the chick evicts the eggs or young of the host species. Online poker software, The chick has no time to learn this behavior, online poker software, so it must be an instinct passed on genetically. Online poker software, The mother still feeds the cuckoo chick as if it were her own, online poker software, the chick’s open mouth serving as a sign stimulus for the host to feed it

Female parasitic-cuckoos seem to specialize and lay eggs that closely resemble the eggs of their chosen host. Online poker software, This has also been aided by natural selection, online poker software, as some birds are able to distinguish cuckoo eggs from their own, online poker software, leading to those eggs least like the host’s being thrown out of the nest. Online poker software, Parasitic cuckoos are grouped into gentes, online poker software, with each gente specializing in a particular host. Online poker software, There is some evidence that the gentes are genetically different from one another.

An ideal breeding habitat for Cuckoos is where there are reed beds and trees. Online poker software, An individual female Cuckoo’s territory will contain up to about 20 Reed Warbler’s nests. Online poker software, Female Cuckoos spend a long time watching over the reed beds in their territory from the trees, online poker software, and watch the behaviour of the Reed Warblers as they build their nests and start their broods. Online poker software, The female Cuckoo has to time her egg laying to just when the reed warblers start to lay eggs. Online poker software, It is not known how the hen cuckoo gets the timing right, online poker software, as she cannot see the Reed Warblers’ eggs from the trees, online poker software, but it is likely that it is from the behaviour of warblers.

At the appropriate moment the hen Cuckoo flies down to the reed warblers’ nest, online poker software, pushes one Reed Warbler egg out of the nest, online poker software, lays an egg and flies off. Online poker software, The whole process is achieved in only about 10 seconds. Online poker software, At 14 days old, online poker software, the Cuckoo chicks are about 3 times the size of the adult Reed Warblers. Online poker software, The numerous and rapid hunger calls of the single cuckoo chick, online poker software, and to a lesser extent its coloured gape, online poker software, encourage the host parents to bring more food. Online poker software, Cuckoo chicks fledge after about 20 -21 days after hatching, online poker software, which is about twice as long as for Reed Warblers. Online poker software, If the hen cuckoo is out-of-phase with a clutch of Reed Warbler eggs, online poker software, she will eat them all so that the hosts are forced to start another brood.

Cuckoo chicks methodically evict all host progeny from host nests. Online poker software, It is a much larger bird than its hosts, online poker software, and needs to monopolise the food supplied by the parents. Online poker software, The Cuckoo chick will roll the other eggs out of the nest by pushing them with its back over the edge. Online poker software, If the Reed Warbler’s eggs hatch before the Cuckoo’s egg, online poker software, the Cuckoo chick will push the other chicks out of the nest in a similar way. Online poker software, Once the Reed Warbler chicks are out of the nest, online poker software, the parents completely ignore them.

The combination of behaviour and anatomical adaptation of the common cuckoo was first described by Edward Jenner, online poker software, who was elected as Fellow of the Royal Society in 1788 for this work. Online poker software, This was well before he invented vaccination.

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