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
Endangered Species Act of 1973 landowner will not be required to do more than already agreed upon in the CCA. The Experimental Population Provision encourages introductions of species into formerly occupied or new habitat without the full range of legal restrictions for endangered species. The provision was added to the act in 1982 to encourage landowner support for species survival and recovery. Experimental populations could be used for the assisted migration of endangered species. To delist species, several factors are considered: the threats are eliminated or controlled, population size and growth, and the stability of habitat quality and quantity. Also, over a dozen species have