How cuckoo birds generate

Sometimes, animals take advantage of other animals. An example of this is how cuckoo birds generate and raise up their children. Usually, they don't feed their children by themselves. When they have eggs, they secretly put each egg in a different nest of other birds. And what is clever that cuckoo birds make their eggs quite similar with other eggs. So other birds can't find the trick and hatch all the eggs. However, the egg of cuckoo birds is hatched out much faster than others. When the little cuckoo births, it is very clever and active. In order to make the foster parents feed it alone, little cuckoo pushes other eggs out of the nest or kill the small birds that are just born. After these efforts, the little cuckoo is the only one baby that can get all of its foster parents' love and care. It is interesting that some days later, you may see a big child bird is fed by small parents. That is because the figure of cuckoo is bigger than most other birds'.