Killer whales will knock over sharks with their heads when they meet them, making them dizzy. So people will play the call of killer whales to disperse sharks near the ship port where there are sharks.
Killer whale is a large toothed whale, an dolphin, which can be regarded as a whale and a dolphin in principle. Among them, Atlantic 2 killer whales and Antarctic A killer whales take whales or even blue whales as their main food, while ocean killer whales take sharks as their main food, so they are well-deserved overlord in the sea. The body length can reach 8- 10 meters, and the weight is about 9 tons. The head is slightly round and has an inconspicuous beak.
The dorsal fin is tall and upright, bending as long as 1 m; The body is black and white. The two wings are far apart. The temporal fossa is large. The mandible is relatively short. There are 10- 12 conical teeth in each tooth row of the upper and lower jaws. Long and thin mouth, sharp teeth, fierce temperament, good at attacking prey.
The life span of killer whales in the wild can reach 80-90 years, but the average life span in human captivity is only 20-30 years. Killer whale is a kind of animal with high IQ, which is as emotional as primates, has a strong language system, has very few dialects among animals, and even uses tones to ridicule the same kind who have failed to hunt, and has a high degree of sociality.
Killer whales are highly socialized animals, and some groups of families are the most stable families in the animal kingdom. Some complex social behaviors, hunting skills and voice communication of killer whales are considered as evidence that killer whales have their own culture. Distributed in almost all marine areas, from equator to polar waters. The water temperature or depth does not limit its range.
Killer whales are not in danger of extinction, but human hunting may have caused a decrease in ethnic groups in some areas. There are only a few hundred killer whales in Washington State and British Columbia, no matter whether they are settled or in transit, and they are threatened by pollution, heavy ships and reduced prey.
Intensive whale watching activities may interfere with the life of killer whales, while those in order to protect salmon farms from the survival threats such as finned-footed driving and reduced prey. Intensive whale watching activities may invade people and drive killer whales out of their original preferred habitat.
It is estimated that there are about 8,500 killer whales in the tropical waters of the eastern Pacific Ocean, at least 850 in Alaska waters, and more than 2,000 off the coast of Japan. In summer, there are about 8,000 killer whales in Antarctic waters, and there may be hundreds to thousands in other areas within the distribution range.
At present, whalers in Japan, Indonesia, Greenland and the West Indies continue to catch killer whales. Although the killing amount is small, it may have a considerable impact on local communities.