Belugas aggregate in herds of hundreds to thousands. Grouping of different pods is still uncertain, but age and sex seem to play a role in the grouping. Five to ten percent of a beluga’s time is spent at the surface of the water. They rarely are seen breeching, although they bounce vertically out of the water about one third of the body length. They swim about 9 to 10 km per hour. Belugas are constantly vocalizing and swimming around, over, and under each other. They also play with objects in the water together or by themselves. These objects are not limited to wood, plants, dead fish, and bubbles that they created.