“Kuoo-Kuoo” “Kuoo-Kuoo’… we the Bangladeshis almost every morning in the winter hear this sweet sound .
Its like a natural alarm which wakes us up. It is the utter of another Bangladeshi beautiful bird ‘Kokil’(The Cuckoo) . For many people, the ‘Kokil’ (Cuckoo) will conjure a image of spring. Cuckoos are long and thin birds, with a little bent bills, extended tails, and elongated, pointed wings. In some aspects the cuckoo is different from other birds. Because they do lay their eggs directly into the nests of other birds, every now and then the shell that they parasitize is diminutive and together with this. At the same time as the host is away from the nest, the cuckoo removes one of the host's eggs and replaces it with one of its own. The young cuckoo hatches quickly, in about 12 days. It is entirely naked at this stage. Soon it disposes of its nest mates - the advance parents' eggs or newly hatched young - by receiving them on its back and approaching them over the border of the nest. Thus the young cuckoo receives all the food and care of the foster parents. Cuckoos generally seem to be friendless because the males are often very outstanding and noisy with unrelenting bouts of loud, striking, and rather monotonous calls, even at night, whereas the females are shy and have dissimilar, even muted, calls. In Bangladesh The Cuckoo is most favorite for its sweet voice. People of sweet voices are very often being compared with ‘kokil’(The Cuckoo) .