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
Asystasia gangetica that use "A. g. micrantha" as a larval foodplant; "Junonia oenone", "Junonia hierta", "Junonia natalica", "Junonia terea", "Protogoniomorpha parhassus", "Hypolimnas misippus" and "Microplexia costimaculalis". The vigorous growth of "A. g. micrantha" in tropical regions makes it a weed which can smother certain indigenous vegetation where it has been introduced. Asystasia gangetica Asystasia gangetica is a species of plant in the Acanthaceae family. It is commonly known as the Chinese violet, coromandel or creeping foxglove. In South Africa this plant may simply be called asystasia. This plant is a spreading herb or groundcover, reaching 600 mm in height or up to