Research on dolphin intelligence has not diminished. It is said that this is the most intelligent aquatic mammal after man. The animal that the lost sailor at sea is overjoyed to see is the dolphin. The question may arise - why? Because dolphins like to be around people. And so when you see a dolphin, you can find the locality.
The funny thing is, like humans, dolphins call each other by name Studies have shown that 'bottle-faced' dolphins call their mother by name and one by name. The results of the study have been published in the National Academy of Sciences. Even this animal commits suicide in anger and grief.
Just as bats fly in the sky and are not birds, so dolphins live in water and not fish. Like bats, dolphins are mammals. In our country dolphins are often called dolphins. Whales and porpoises belong to the same class. There is no comparison of the intelligence of this strange creature. Dolphins are said to be human friends at sea. Just as it helps a lost sailor to find shore in the sea, dolphins also come to the rescue of people from predators such as sharks that sink ships in the deep sea. Dolphin armor made around the sinking sailor. So where the dolphins meet, there are a lot of peaceful seafarers. Interestingly, they are very friendly with children. Dolphins also have the intelligence to identify boys, girls or children. They are imitative and can easily understand different shapes. So in many countries dolphins are shown in funny games in oceanariums or water parks. In addition, fishermen often take the help of dolphins in fishing in the sea. The intelligent creature chases the swarm of fish and leads it towards the prison net. There are also reports of drowning sailors carrying dolphins on their backs to shore.
Dolphin means lip. Their noses are like lips, their bodies are elongated. The dolphin is small in size, with a snub nose. There is also a fish called dolphin. This tall fish is blue in color, with bright golden, green and purple hues. Weight 30 kg, about 2 meters long. Alone or in a herd. The number of marine dolphin species is 32. 5 freshwater species. They live on the rivers of South America and South Asia. Of all the species, the bottle-faced dolphin, the pink dolphin, the spinner dolphin and the parapoise are notable. River dolphins are somewhat smaller in size. Body length is up to 2.6 meters. They live in muddy water. Mammals are thought to have once lived on land. Later, seeing the unfavorable environment on the shore and the abundance of food in the water, they adapted to the water. In our country there is a species of dolphin - dolphin. Earlier, they were often seen in different rivers including Padma, Meghna and Shitalakshma. Due to river pollution, lack of adequate food in the water, and many other reasons, they are no longer seen. However, dolphins are still found in Karnafuli and coastal rivers. Seen in various rivers and canals around the Sundarbans.
The dolphins seen in Bangladesh do not have axillance, they swim on one side. The bottom of the river is lined with crabs. Indus river dolphins prey on prey in the Yellow Sea. Most dolphins move in groups and are mainly fish-eaters. They breathe through a hole in the back. Shape like a fish, body elongated, hairless. They have 180-200 sharp teeth. The eyes are medium sized, the ear pores are very small. Breathing leak is crescent shaped. Most dolphins have black backs and white breasts. Dolphins give birth to a baby at once and are very instrumental towards the child. With strong horizontal tail fins, they move freely under and above the water, and the front and back fins work smoothly. They do not have any parasitic infection on their body to change the shell frequently. A layer of fat protects them from cold and heals wounds.
Dolphins are great hunters too! Baby dolphins stay with their mother for a certain period of time. Then if you get used to hunting, it becomes different. Killer whale dolphins can jump about three meters high while hunting sea seals or penguins.
Sadly, the number of these funny and useful animals is decreasing day by day. Water pollution, malnutrition and even the collision of big ships every year are killing a lot of dolphins.