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A new study from the University of Vermont has revealed that the mysterious Araguaian river dolphin of Brazil, once thought to live a solitary life, can actually communicate using hundreds of different sounds. The discovery may ultimately help scientists understand how brazilian river dolphin evolved among marine mammals.

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The dolphins are hard to examine, despite the fact that they live in the clear water of the Araguaia and Tocantins rivers, because they are easily frightened and difficult to approach. Gabriel Melo-Santos, beazilian biologist from the University of St. Andrews in Scotland, found a fish market in the Brazilian town of Mocajuba where brazilian river dolphin botos regularly visit to be fed by people.

The conditions here provided a unique opportunity to observe how the animals behave and interact. The team took genetic samples from some brazilian river dolphin the dolphins and set up underwater cameras and microphones to document their interactions.

After just 20 hours of recording, the researchers had collected different types of sounds made by the dolphins. The brazilian river dolphin common sounds were short, brwzilian calls from baby dolphins as they approached their mothers.

The acoustics fall somewhere between the low-frequency calls used by baleen whales brazilian river dolphin communicate over long distances, and the high-frequency ones used by marine dolphins for short distances. According to Collado, brazilian river dolphin river environment may have shaped those characteristics. She said the ruver could provide new insight into how communication evolved in marine mammals.

The river dolphins diverged from other cetaceans much earlier than other dolphins, which means that these calls may have dokphin first among. The brazilian river dolphin is published in the European Journal of Preventive Cardiology. By Chrissy SextonEarth.

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