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Introduction


Finch
Charles Darwin is known for his Theory of Evolution. The credit for making him think about the process of evolution goes to the 14 different species of Finches of the Galapagos Islands. Darwin noticed the bill of these finches and found they varied from very slender to deep and heavy. While the Galapagos finches had their basic form unchanged, some of their physical forms such as the bill had undergone modification to suit to local conditions from island to island. The woodpecker finch of Galapagos Islands does not have the long bill and tongue to hunt for insects in the tree bark. It has learned to use a cactus spine as a tool. The bird breaks a cactus spine to an appropriate length and uses it to dig out insects. Young finches learn this habit by observing the parents. The technique is passed on from generation to generation. Pair bonding between finches is very interesting. A female finch selects a right male partner after a careful consideration. Once she decides, the chosen male partner will begin guarding her. The male will ensure that another male does not approach his partner. While the female finch hops around collecting the nest material, the male will watch her from close quarters. The female Australian grass finch relies on her mate to seek a potential nest site. After the male finds a site, he will attract the female by hopping back and forth and calling out. The female then inspects the site. If she does not find it suitable she will simply fly off. The male will have to continue his search. The process may go on a hundred times or more until the female approves one and accepts to build a nest. The vampire finch as the name indicates feeds on blood. It looks for masked or red-footed boobies. It lands on the tail and pecks the skin forward until bleeding starts. It then drinks the blood. Finches are small birds the size of sparrows. They are very attractive birds with colored plumage of different shades and are the most preferred birds in the aviaries all over the world.

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