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
Patna Marathon "Gangetic Dolphin" has been chosen as the Mascot for Patna Marathon. It has been named "Paltan" which is derived from the biological name of the species "Platanista Gangetica". The mascot has been developed to raise awareness about the conservation needs of the most threatened cetacean and among the world's most threatened mammals and its habitat. Patna Marathon is organized by the Bihar Entrepreneur network (BEN) in association with Bihar Society, Karma Society and various other individuals and organizations. Patna Marathon The Patna Marathon 2012 (PM 2012) is the first international-level marathon organised in Patna, Bihar, India. First edition was held