@Milan1999 27 May 2021 more from that month

20 interesting facts about dolphins 1. Maui dolphins are the smallest. They are about 120 cm long and weigh about 40 kg. The largest are orcs, also known as killer whales (yes, they belong to dolphins). Males of this species usually reach a length of 6 to 8 meters and a weight of more than 6 tons. 2. Most dolphins live long. The most famous species, Tursiops (Bottlenose), has an average lifespan of 40 years, and some orcas live to be 80 years old. 3. Dolphins cannot breathe automatically. Because of that, during sleep, one half of their brain is awake, while the other is resting, and then the other wakes up, and the first falls asleep. Dolphins spend about 8 hours a day in this state, which allows them to consciously control their breathing and occasionally swim to the surface to catch their breath. 4. Dolphins use not only eyes, but also ecolocation (similar to sonar) to avoid obstacles and find prey. 5. The name dolphin comes from the Greek word "delphis", which roughly means "fish with a uterus". Photo: Shutterstock 6. Scientists have discovered that dolphins teach their young to use tools and to organize a kind of funeral ceremonies for deceased individuals. 7. The ancient Romans once used dolphins as fishing aids. They were trained to push smaller fish towards them, and when a large enough group of fish gathered in one place, dolphins would signal to the fishermen that it was time to cast their nets. Even today, it is hunted in some parts of Santa Catarina in Brazil. 8. Amazon dolphins swim upside down. It is believed that the humps on their backs help them feel the bottom of the river in order to find food on it. This way of swimming also helps them discover what is under them, because they have slightly larger cheeks under their eyes that make it difficult for them to look down. 9. Dolphins are the only species of animals, other than humans, that develop the natural form of type 2 diabetes. 10. Dolphins are also drugged. 11. Dolphins have the ability to recognize, remember and solve problems, which makes them one of the most intelligent creatures on the planet. 12. Dolphins can be happy, sad, and even angry. They know how to be angry and take revenge on people. 13. Pregnancy is considered a fascinating phenomenon, so they gladly gather around the pregnant woman, which is why they avoid entering the water. Too bad! They would enjoy. 14. Each dolphin has a unique dorsal fin, which is used for easier recognition and identification. 15. Numerous cases of dolphins helping each other in trouble have been reported. It has even been noted that they can make a raft out of their bodies and thus carry the sick or injured. Photo: Shutterstock 16. It seems that their empathy knows no bounds, because it has been noticed that they help people in trouble, and even whales much bigger than themselves. 17. Dolphins are extremely playful and curious animals. They play with each other, but also with other species - humans and dogs. 18. Dolphins can be real seducers. Males gather seagrass to make something reminiscent of a bouquet of flowers that they then carry to their ladies. At first, scientists believed that they were just playing, until they noticed that males always make bouquets, and that they always make them in front of females. 19. Recent research shows that dolphins have their own names, and that they can call each other. 20. One of the main causes of death among dolphins in captivity is suicide. They can commit suicide in a number of ways, the most common being refusing to eat or hitting their head against the pool walls.