Marine dolphins work in pods (packs) because when they find a shoal of fish then they work together to make the most of their find. River dolphins are less active than marine dolphins because they do not need to search so widely to find fish.
River dolphins have smaller eyes than marine dolphins, and their vision is poorly developed because they live in dark, muddy water. They use their long snout to search for fish on the muddy bottom of the river. The snout of a river dolphin measures about 58 centimeters (2 ft) long, approximately four times as long as that of most marine dolphins. 1 Differences between marine and river dolphinsĭifferences between marine and river dolphins īoth river dolphins and marine dolphins belong to a group of mammals called cetaceans.Scientists now want to raise some dolphins in a lake. Recent counts have come up with 17 remaining individuals. Chinese river dolphin (or Baiji), Lipotes vexillifer – Lives in the Yangtze River in China (one of the most endangered of all dolphins and whales).La Plata dolphin (or Franciscana), Pontoporia blainvillei – Lives in Argentina.Identified as a separate species by genetic sequence analysis. Araguaia river dolphin, Inia araguaiaensis – Recently discovered in the river basin in Brazil after which it is named.
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