These beautiful photos showcase the extraordinary talent of a group of clever whales.
The majestic white creatures have learned to blow shimmering, ring-shaped bubbles under the water at their aquarium in Japan.
Air is blown out of the whale's mouth to create a current, before the brilliant beluga sends a second gust from its blow hole to shape the bubble into a ring.
Hiroya Minakuchi, from Osaka, dived with the animals at Shimane Aquarium to take the incredible pictures.
He is the only person other than workers at the aquarium to have dived with them, and said he believes the trick is very rare.
He added: 'I believe it is just a lot of fun for this particular beluga. Since she developed this new game she often performs it for visitors.
'So far I am an only person who can dive with belugas for photographing except for aquarium trainers.
'I believe this kind photo should be very rare.'
The aquarium is set on Japan's coast in the Shimane Prefecture, in Iwami Seaside Park.
Its fantastic collection of fish swim in 3,000 tons of water, with the playful belugas its star attractions.
The beluga, or white whale, is an Arctic and sub-Arctic dweller known as a sea canary because of its high-pitched squeaks, clicks and whistles. It can also mimic a variety of other sounds.
White whales are fairly small, ranging from 13 to 20 feet (4 to 6.1 metres) in length.
Belugas generally live together in small groups known as pods and are social animals.
One Japanese researcher even claims belugas are so intelligent he taught one to 'talk', using its sounds to identify different objects.
The beluga has a distinctive protuberance on its head and is related to the tusked 'unicorn' whale, the narwhal. There are only around 100,000 left in the world.