The Tamil Nadu synchronised bird estimation was conducted by the state Forest Department.
Nearly 79 per cent of a total bird count of 6,80,028 are being water birds.
About 21 per cent are terrestrial birds.
The estimation has covered 894 vantage points at wetlands/water bodies/bird sanctuaries including 179 in forest areas, 555 in rural areas and 170 in urban areas.
A total of 6,80,028 birds covering 389 bird species were found in the estimation.
Out of these 120 species are found to be water birds and the remaining 269 are terrestrial bird species.