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 1969 passed prior to the 1969 act, and set up a list of species native to the United States that qualified as endangered. The animals on this list were then afforded certain protections from the National Wildlife Refuge System. For example, the Endangered Species Preservation Act was in part dedicated to raising awareness of endangered species of birds like the peregrine falcon, and to "conserve, protect, restore, and propagate certain species of native fish and wildlife". Despite these protections, however, researchers found that the act was insufficient. This led to the passage of the Endangered Species Conservation Act of 1969. The