Off the coast of California, 1,500 dolphins swam together—an incredible sight captured on drone video.

On the central coast of California, in Carmel Bay, a remarkable phenomenon has been observed — over one and a half thousand Risso's dolphins formed what is known as a "supergroup," leaping and gliding across the water's surface. This is a unique occurrence, as these marine mammals typically travel in small groups of 10-30 individuals.

Monterey Bay Whale Watch managed to capture this unusual sight using a drone. The team was on a boat searching for gray whales when the dolphins literally surrounded the vessel and swam alongside it, according to eyewitnesses in a comment to AP.

Some dolphins even swam in front of the boat, using the waves to gain speed. The large number of both adult and young dolphins indicates that several groups have come together while heading south. This is how the "supergroup" was formed.

The Monterey coastline is an ideal location for such observations due to the underwater canyon that allows dolphins to approach closer to shore. However, even here, phenomena of this scale are rare.

Previously, "Telegraph" reported on how the abnormally warm winter affected animal behavior. Some animals received "bonuses," while others face threats. Among the animals benefiting from the warm winter are the European bison. These creatures were nearly wiped out in Ukraine, while efforts to restore the bison population are underway.