Question

paragraph of freshwater Dolphin 80---100 words​

Answer 1

Answer:

River dolphins are a polyphyletic group of fully aquatic mammals that reside 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 two superfamilies, Platanistoidea and Inioidea. They comprise the extant families Platanistidae (the Indian dolphins) (Old World family), Iniidae (the Amazonian dolphins) and Pontoporiidae (the brackish dolphins) (New World families). There are five extant species of river dolphins. River dolphins, alongside other cetaceans, belong to the clade Cetartiodactyla, with even-toed ungulates, and their closest living relatives the hippopotamuses, from which they diverged about 40 million years ago.

Answer 2

Answer:

Freshwater dolphins are found living in rivers and lakes in South America, as well as east and southeast Asia. These dolphins have unique features, habitats and hunting skills that have evolved to fit their freshwater demands.Freshwater river dolphins share similar appearances and features, such as long, thin snouts. These dolphins also vary in physical characteristics, such as size and body color. Amazon river dolphins are the largest of all freshwater dolphins, growing up to 10 feet long.Freshwater dolphins all have one thing in common in terms of their environment, and that is they live and breed in freshwater. However, the different species of freshwater dolphins live in different habitats.

Explanation:

The Amazon river dolphin is found in South America's Amazon and Orinoco river basins. This dolphin prefers faster clear, white or black water rivers. It is also found swimming in lakes and tributaries, and sometimes in flooded forests. On the other hand, the tucuxi, which is also found living in the Amazon and Orinoco rivers, prefers to swim in shallow estuaries and bays and avoids faster waters and flooded forests. The Ganges river dolphin is found in rapid, clear water river systems traveling through India, Nepal and Bangladesh. The Indus river dolphin lives along the Indus river and its tributaries and channels in Pakistan. The freshwater Irrawaddy dolphin is found swimming in southeast Asia in shallow river systems. The extinct Yangtze dolphin was found in China's freshwater lakes and rivers. Finless porpoises are also found in southeast Asia.There are several species of dolphins living in freshwater: the Amazon river dolphin, tucuxi, Ganges river dolphin, Indus river dolphin and Irrawaddy dolphin. All of these dolphin species are classified as either vulnerable, endangered or critically endangered by the World Wildlife Fund. The Yangtze river dolphin was listed as extinct as of 2006. There is also one species of freshwater porpoise, the finless porpoise, which is endangered.