Birds Migration


     Bird migration is a periodic movement of birds between their breeding and non- breeding area or and any regular movements of birds that forms part of their life cycle the term ‘migration , generally refers to the periodical movements of birds, ie, across the borders is is described as Local migration and seasonally up and down mountains as altitude migration of the 2100species and subspecies of birds in the Indian subcontinent about 300 are migrants from land beyond the Himalayas central the northern Asia and northeastern Europe. These species that breed on our Northeastern and Northwestern borders behave like true migrants they keep the same time schedule for arrival and departure beside some of the local migrants may move a few kilometers and other move attitudinally from the snow line in summer down to the foothill. The major groups of Indian migrants are: ducks, goose, waders or shore birds, swallows flycatcher’s warbler’s thrushes and chats wagtails and pipits, finches and bunting

             Main reason behind migration is survived winter is server and day is short beyond the Himalaya. These conditions are not suitable for finding food. Hence, by September/October the birds move south ward to warmer region, sometimes more than 500km away. By march/April they return to the northern reading area where temperature and competition for food and nest. Sites are comparatively less. Spring migration is linked with the development then of the reproductive organs.

Journey is undertaken singles, in small parties or long flocks, at times several species together.  Migrants are either diurnal, space nocturnal or both.  



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