Unfortunately, it's still unclear why the otters do it. Some believe that it's merely an act of play solely for entertainment purposes. Think of a cat playing with a ball of thread. Or a dog having fun with a twig. It's possible that the otters are just juggling for fun. However, the bizzareness of the act makes some to propose that there's more to the act than just a mere source of entertainment. The otters doesn't seem to play with other things the way other animals do. They prefer pebbles over anything else.
One theory is that this activity has something to do with eating behavior. This is because otters often use rocks as tools in smashing the shells of mollusks to gain access to the meat inside. Some suggest that there's a connection between the two. Some otters have been observed vigorously defending the rocks they have against other otters.
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