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Adult dolphins reach sizes from 1.2 m in length and weight from 40 kg (river dolphin), to 9.5 m and 10 tons (killer whale).
This animal has an amazing ability to echolocation.
This allows dolphins to pick up sounds and transmit information to each other over long distances.
They have a unique hearing of two types. They see equally well in water and in air - this ability has also not yet been solved.
Dolphins are very fast animals - they reach speeds of up to 55 kilometers per hour.
They are exceptionally intelligent.
Professor Portman from the Swiss Institute in the course of a study found that dolphins are only slightly inferior to humans in terms of intelligence.
The scientist assessed the human mind at 214 points, the dolphin at 195.
A team of physicists and marine biologists from Norway and Germany have created an algorithm that can quantitatively analyze the sounds made by common pilot whales (Globicephala melas) and even distinguish between dialects between different groups.
Previously, we told interesting facts about whales.