Three videos this week showing a cool underwater phenomenon: bubble rings. They are a bit like smoke rings, but hold their shape for an amazingly long period of time.
This first video shows Beluga Whales playing. Start from around 0:30s till about 1:40:
It’s not just Beluga Whales that are clearly very intelligent animals. Dolphins are even more amazing in their bubble ring play:
Lastly, at first I didn’t even believe that this was an air bubble, but it is: