A new report from the American Museum of Natural History features what they believe to be the first recorded evidence of whales and dolphins playing together in the wild.

Photographs captured off the coasts of Kauai and Maui, Hawaii, show wild humpback whales and bottlenose dolphins engaging in some fun water sports. In the pictures, a dolphin lays across the head of a whale, and then the whale lifts its head slowly until the dolphin gently slides back into the ocean.

"The two species seemed to cooperate in the activity, and neither displayed signs of aggression or distress," says the museum's Bio Bulletin. "Whales and dolphins in Hawaiian waters often interact, but playful social activity such as this is extremely rare between species."

Check out the photographs in the video below.