Lagenorhynchus obliquidens

Pacific spotted dolphins are very active and expressive, creating large clouds of water. They often leap into the waves, sometimes spinning or flipping in the air, landing on their sides or bellies. They are good fast swimmers, and some individuals may swim together. They like to surf on the ocean waves and ride the stern of ships, and are keen on riding the bow of ships. They seem to appear quietly. They swim close to the water, with only their dorsal fins exposed, resembling sharks. Large groups may break up into smaller groups to feed, but will regroup when resting or swimming. They are often accompanied by other cetaceans; they may also be in the company of sea lions and seals. They are very curious and may approach stationary ships.

Pacific spotted dolphinsLarge groups will create a lot of ripples on the water. So before you start to trap them, you will see a lot of water waves. There are huge differences between individuals, and the younger ones are less obvious. The appearance is very similar to the dark spotted dolphin, but the distribution ranges of the two do not overlap. When swimming fast, Pacific spotted dolphins may create large clouds of water mist, the so-called "rooster tail mist", so if observed from a distance, they may be mistaken for white-rumped porpoises.

Pacific spotted dolphins are highly attached and will not leave if their companions are injured.

Listed in the 2012 Red List of Endangered Species of the World Conservation Union (IUCN) ver 3.1 - Least Concern (LC).

Listed in the second level of the List of Key Protected Wildlife in China.

Pacific white-faced dolphins are distributed in Canada, China, Japan, the Democratic People's Republic of Korea, the Republic of Korea, Mexico, the Russian Federation, and the United States. In China, they are distributed in the Yellow Sea, the East China Sea, and the South China Sea. Pacific white-faced dolphins usually live in warm waters along the coast at low latitudes in winter and spring, and live in deep ocean waters or swim northward to high latitude waters in summer and autumn.

The Pacific white-faced dolphin is generally 2-2.3 meters long and spindle-shaped. The front of the dorsal fin is thick and round, and the body tapers sharply from the anus to the back. The snout of the head is short and flat, and the back rises gently from the base of the snout to the back, with a clear boundary between the snout and the forehead. The mouth is small, the upper and lower jaws are nearly equal in length, and there are 30-35 teeth on each side of the two jaws. The eyes are small, nearly round, and located slightly above the corners of the mouth. There are obvious ridges above and below the caudal peduncle. The dorsal fin is tall and sickle-shaped, located slightly forward of the middle of the back of the body, about 1/12-1/6 of the body length, with a wide base, a front edge tilted backward, a sharp top angle, and a concave rear edge. The flippers are medium to large, with a wide base, an arc-shaped front edge, a sharp outer angle, and a concave rear edge from the convex