Migratory birds have started flocking to the waterbodies of the Berhampur forest division in Ganjam district that borders Chilika lake, a major destination for avian guests on the Odisha coast.But because of the high water level and abundant growth of vegetation, fewer birds were sighted during the recent bird census. The census conducted on January 3 has led to the enumeration of 8,542 migratory birds in large waterbodies of the Berhampur forest division.In comparison to the bird census of January 3 last year, the birds counted in the forest division this year has gone down by around 4,000. But Divisional Forest Officer, Berhampur, Ashis Behera said the fall in the number of birds sighted during the census this year was because of environmental conditions.Heavy rain has kept the water level in the waterbodies quite high this year increasing their surface area, because of which there has been abundant growth of high grass and other vegetation. This provides ample scope for the birds to hide away from the eyes of the enumerators, said Mr. Behera. Because of it fewer birds were counted.The bird census was conducted in 37 large waterbodies of the Berhampur forest division.