Common Name: Great Egret
Scientific Name: Casmerodius albus
Nepali Name: Thulo Setobakula ( ठूलो सेतोबकुल्ला )
Size: 85-100 cm
Location: Chitwan, Nepal

Great Egrets are seen in wetlands like rivers, marshes below 300m elevation and are fairly widespread.

Large in size, white in color, long S-shaped neck, black feet, and a large bill are what can be described for this bird during the non-breeding season, with darker bill and the lower legs lighter during the breeding season.  Standing tall around 85-100m and with a wingspan of 131 to 170 cm, Great Egrets can be different from the intermediate egret by the gape which extends beyond the back of the eye. 

Please feel free to comment below if the above species has been misidentified.