In the previous years, huge flocks of migratory birds came to the wetland in early October. But surprisingly, only a few migratory birds have arrived at the beel this year.

Mention may be made here that global warming, drastic climate change, speed of monsoon wind and pollution are primarily responsible for non-arrival of the migratory birds to the Ransar Site this winter season. The environmentalists have observed that though earlier a mild atmosphere prevailed during the daytime, in September this year the arrival of migratory birds to the beel was much below expectations.

The migratory birds from various parts of the country as well as from far-off places like Siberia, Turkey, Afghanistan and Switzerland used to arrive at the Ramsar Site during the first part of autumn every year. However, a flock of migratory birds have since arrived at the waterbody, though much less in numbers, a section of local nature-lovers informed.

It has been learnt that as per a survey conducted in 2008, out of 120 species of migratory birds, 66 and 54 species have been identified as non-aquatic and aquatic respectively. It may be noted that the number of migratory birds to the Beel has been decreasing annually, probably due to increase in overall world temperature, high decibel sound of trains passing by the side of the Beel and a chaotic atmosphere created by the local fishermen in the wetland; ornithologists and environmentalists here feel.