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baiji, Yangtze river dolphin
Baijis have a fusiform body with a small head, tiny eyes, prominent melon and a long, narrow beak that is slightly up-curved at the tip. The dorsal fin of the baiji is low and triangular and the flippers are broad and rounded. The dorsal portion of the body is gray with whitish streaks from the ventral area extending into the face and head region.
Females are slightly larger than males
To 2.29 m (7 ft 6 in)
To 2.53 m (8 ft 4 in)
130 kg (290 lb)
170 kg (370 lb)
Very little is known about reproduction, but gestation probably lasts 10-11 months
China's Yangtze River
Probably in the 10's or even less than 10; baijis are the world's most endangered cetacean
Scientists have placed the baiji in the family Platanistidae, the river dolphin family. Four other species of small cetaceans also are in this family. They are:
boto (Amazon river dolphin)
, South America
franciscana (La Plata river dolphin)
, South America
Ganges susu (Ganges river dolphin)
Indus susu (Indus river dolphin)
Baiji is a Chinese word meaning "a white dolphin." This species is one of the most endangered cetaceans in the world, with a population numbering in the tens or fewer.
ECOLOGY AND CONSERVATION
Little is known about a river dolphin's natural history. However, several species are in danger of extinction. Threats to river dolphin populations include pollution, subsistence hunting, industrial development, dam construction, riverbank deforestation, over fishing, and incidental capture in commercial fisheries.
Why is the baiji endangered? Varying water levels in the Yangtze River due to industrial development have limited available habitat. Over fishing has decreased the baiji's food supply. Pollution harms both the dolphins and their prey. Baiji may be injured or killed by explosions during construction, and by boat propellers.
A number of baiji are caught and killed by illegal fishing devices called rolling hooks. These long, braided lines with numerous sharp hooks are meant to catch fishes. However, baiji also may become ensnared in the mass of hooks. Others become entangled in stake net traps.
The baiji has been protected by China since 1975. Chinese biologists began devising a protection strategy in 1986. By establishing reserve sites along the Yangtze River, scientists are hopeful that the species can be saved.
Jefferson, T.J. Leatherwood, S. and M.A. Webber.
FAO Species Identification Guide: Marine Mammals of the World
. Rome. FAO, 1993.
Leatherwood, Stephen, and Reeves, Randall R.
The Sierra Club Handbook of Whales and Dolphins
. San Francisco: Sierra Club Books, 1983.
Nowak, Ronald M. (ed.).
Walker's Mammals of the World. Vol. II
. Baltimore: Johns Hopkins University Press, 1991.
Parker, S. (ed.).
Grizmek's Encyclopedia of Mammals. Vol. IV
. New York: McGraw-Hill Publishing Co., 1990.
Reeves, R. R., Stewart, B.S., Clapman, P.J., and J.A. Powell (Peter Folkens illustrator).
National Audubon Society: Guide to Marine Mammals of the World
. New York: Random House, 2002.
IUCN Animal Info - Baiji Page