Ganges Delta trees are found in these areas. The delta region has mangrove trees. It is estimated that 30,000 chital ("Axis axis") are in the Sundarbans part of the delta. Birds found in the delta include kingfishers, eagles, woodpeckers, the shalik ("Acridotheres tristis"), the swamp francolin ("Francolinus gularis"), and the doel ("Copsychus saularis"). Two species of dolphin can be found in the delta: the Irrawaddy dolphin ("Orcaella brevirostris") and the Ganges river dolphin ("Platanista gangetica gangetica"). The Irrawaddy dolphin is an oceanic dolphin which enters the delta from the Bay of Bengal. The Ganges river dolphin is a true river dolphin, but
Protogoniomorpha parhassus with black. There are black spots near the margins of both the forewings and hindwings. The underside of the wings has a greenish-white base colour, with eyespots corresponding to those on the upper surface. This species lays tiny eggs similar to those of "Junonia" and "Precis" species. The larvae are similar to those of "Junonia" and "Precis" species, but larger. They feed on "Asystasia" ("A. gangetica"), "Brillantaisia", "Isoglossa" ("I. woodii" and "I. mossambicensis" ), "Mimulopsis", and "Paulowilhelmia" species. The pupae are similar to those of "Junonia" and "Precis" species, but larger. The flight period of the adults is year round,