|Image from Wildlife Extra|
Baijis (Lipotes vexillifer) have existed for millions of years, and are recorded in Chinese history for nearly two millennia. They are one of five species of freshwater dolphin, all of whom are listed by the IUCN as between vulnerable and critically endangered.
Baijis, like all dolphins, hunt by means of echolocation. They typically feed during the day and consume a variety of fish species that are found on both the river bottoms and on the surface. Another similarity to their saltwater cousins is their social organization. They live in small groups and use a variety of clicks and whistles for communication.
Physically, the Baiji grows to be about 8 feet long and weighs 500lbs. They have grey bodies, very long snouts, low dorsal fins, and small eyes that are functional but not especially useful in the murky waters. Gestation is 10-11 months, and one calf is born at a time. Life expectancy is around 25 years, based upon dentition and captive individuals.