In the northwest sea area of the United States (the sea area near Washington state of the United States and BC Province of Canada), there are a group of marine residents. They are residents earlier than Indian residents. They are black and white, naive and roam in the vast Pacific Ocean; Although they have a very fierce name "killer whale", they are actually very docile family animals. The family live in harmony, help each other and are very loyal. They are the masters of the sea.
In fact, killer whales are close relatives of dolphins. They are likely to have the same ancestor in ancient times, but they continue to differentiate in the long process of evolution, and finally there are obvious differences. But until today, people can still find similarities between killer whales and dolphins from other places. For example, they are good at getting close to humans and are one of the few intelligent creatures in the ocean.