Bird migration is a regular and seasonal movement of migratory birds from one part of the world to another part of the world and return toward their native place. This phenomenon is a type of seasonal movement of migratory birds because it is regulated by the biological rhythm or internal biological clock. Bird migrates because of many purposes like sheltering, feeding, breeding, nesting etc. Many other factors which induce the biological clock seasonally like freezing, photoperiodism, fat deposition, seasonal variation, Inherited instinct behaviour etc. So, there are many migratory birds migrate between breeding and wintering grounds. Wintering grounds like Indian thar desert jodhpur area in Rajasthan, in jodhpur area, there are many waterbodies which have rich diversity of migratory birds like Casti pond. Thus, the winter season of every year, many species and thousands of Migratory birds come and stay at Casti pond in Bhopalgarh (Jodhpur). Migratory birds like Black wing stilt, Common coot, Bar headed goose, Indian cormorant, great cormorant, common moorhen, Demoiselle crane, little grebe, Eurasian Spoonbill, Indian spot billed duck, Gadwall, Knob billed duck or comb duck, Northern Pintail, Northern shoveler, Marsh sandpiper, Ruff bird, Great blue heron, Painted stork, Common pochard, mallard duck, Red naped ibis, Black headed ibis, etc. These migratory bird species arrived and observed in the mid-September of 2021 and start to return after February or stating of the March month 2022.

Bird migration, Diversity of migratory birds, Casti pond.