The present study is aimed to investigate the population and richness of egrets and herons in five areas of Pichavaram mangroves during the study period. Totally 10 species are identified in which 4 species are egrets and 6 species are herons. The diversity, breeding and behavior of egrets and herons are noticed in the present study. The herons species are moiré than the egrets in Pichavaram mangroves.