Spy-hop

Gradually, spy-hopping humpbacks viewing whaling vessels became mating whales embracing in a double spy-hop.

Source: wiktionary

Soon, a mother whale marked by nature with a white, iris-shaped star on her side and a calf with a matching star surfaced bear the bow of our boat where I was sitting. Then they popped up together in a dual spy-hop.

Source: wiktionary

Humpbacks are known to spy-hop and are perhaps the most aerial of cetaceans.

Source: wiktionary

It was once thought that they stood on their tails on the ocean bottom to do this, but grays have been seen spy-hopping in very deep water and obviously can spy-hop merely by treading water with their tail flukes.

Source: wiktionary