River dolphin - Wikipedia
River dolphins are a polyphyletic group of fully aquatic mammals that live exclusively in freshwater or brackish water. They are an informal grouping of dolphins, which itself is a paraphyletic group within the infraorder Cetacea. Extant river dolphins are placed in …
River dolphin | Types & Facts | Britannica
river dolphin, any of six species of small, usually freshwater aquatic mammals that are related to whales (order Cetacea). These dolphins are found in rivers of south-central Asia, China, and South America and in the coastal waters of Brazil, Argentina, and Uruguay.
Freshwater dolphin species and facts | Stories | WWF - World …
2022年4月14日 · Swimming through rivers in parts of South America and Asia is what one might consider an unexpected figure: the dolphin. It joins the ranks of the shark and the sea turtle as some of the oldest creatures on Earth.
Amazon River Dolphin (Pink Dolphins) | Species | WWF - World …
The Amazon river dolphin, also known as the pink river dolphin or boto, lives only in freshwater. It is found throughout much of the Amazon and Orinoco river basins in Bolivia, Brazil, Colombia, Ecuador, Guyana, Peru, and Venezuela. It is a relatively abundant freshwater cetacean with an estimated population in the tens of thousands.
River dolphins - Whale & Dolphin Conservation USA
2022年5月10日 · River dolphins are among the most seriously endangered of all dolphins because they live in freshwater river systems, where space is far more limited than oceanic waters; and they live beside millions of people who compete for the same natural resources.
River dolphins on the brink: Where the enigmatic river dolphins …
Discover why river dolphins are important, how they differ from marine dolphins, and the differences between the species are in our expert guide by the WWF.
River dolphins worldwide
River dolphins make their homes in some of the greatest rivers on the planet, sometimes navigating long distances between feeding and breeding areas with the seasonal shifts linked to water levels. The eight tropical and subtropical river basins where they are found are: the Amazon and Orinoco in South America, and the Ganges-Brahmaputra-Meghna ...
Dolphin | Facts & Pictures | Britannica
2024年10月31日 · dolphin, any of the toothed whales belonging to the mammal family Delphinidae (oceanic dolphins) as well as the families Platanistidae and Iniidae, the two that contain the river dolphins. Of the nearly 40 species of dolphins in the Delphinidae, 6 are commonly called whales, including the killer whale and the pilot whales .
Ganges River Dolphin | Freshwater Dolphin | Species | WWF
Learn about the Ganges river elephant, as well as the threats this species faces, what WWF is doing to protect its future, and how you can help.
Chinese River Dolphin - NOAA Fisheries
2017年11月15日 · The Chinese river dolphin is a freshwater dolphin and one of the most endangered animals on Earth. It is found in the Yangtze River in China. Under the Endangered Species Act, NOAA Fisheries must list threatened and endangered marine species regardless of where they are found.