Dolphins can make bubble rings in the water

Why are dolphins considered one of the smartest animals in the sea? Well, this video may explain that answer to some degree.
Here, we can see dolphins playing in the water with bubble rings that they have somehow learned to do on their own!
According to Project Delphis, the dolphins create these bubble rings in the water “by injecting air into water vortices, about the thickness of a straw and 1 to 2 feet in diameter. The rings don’t rise to the surface! The babies play with these underwater toys by moving them around with their rostrum, or biting them. They even bounce the rings off the wall, and elongate them with a flick of their dorsal fins into 15 foot corkscrews.”
That’s just amazing. You have to watch the video above to see it in action!
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