Belugas are extremely intelligent and playful and they’re one of the few cetacean species that have some muscles in their faces so they can show expression. This and the beluga in the video are clearly fooling around to get a reaction. Ignore the insaniac in the YT comments section who says the beluga sees the kids as food. It’s nonsense. Many marine mammals in captivity display this type of behavior. I once saw a walrus in Coney Island who quite obviously enjoyed interacting and playing with children by pressing his great, blubbery face up to the glass and creating massive clouds of spume. The kids screamed and fell about laughing. Having said all that, I don’t approve of keeping these creatures in tanks. Watch the doc Blackfish and you’ll see what I mean.