And the great dolphin Delphinidae; Dolphins are 1.2 ~ 4.2 meters long and weigh 23 ~ 225 kilograms. Dolphins generally have sharp mouths, with about 10 1 fangs in the upper and lower jaws. They mainly feed on small fish, squid, shrimp and crab. ?

Big dolphins like to live a "collective" life, and the number ranges from a few to hundreds. Dolphin is a marine mammal with superb skills and intelligence. After training, I can play table tennis, jump in the ring of fire and so on.

The brain of the big dolphin is the most developed among animals other than humans. Human brain accounts for 2. 1% of my weight, and dolphin brain accounts for 1.7% of my weight.

The dolphin's brain consists of two completely separate parts. When one part is at work, the other part gets enough rest, so it can stay awake for life. Dolphins judge the distance, direction, position, shape and even the nature of objects by echolocation.

Some people do experiments, blindfold dolphins and wade in muddy water. They can catch up with the food thrown at them quickly and accurately. The great dolphin not only has amazing hearing, but also has superb swimming skills and unusual diving skills.

Some tests show that the diving record of dolphins is 300 meters deep, while people can only dive 20 meters without diving suits. As for its swimming speed, it is unmatched by human beings. The speed of dolphins can reach 40 kilometers per hour, which is equivalent to the medium speed of torpedo speedboats.