I wasn't sure where to place this, but it is so interesting that I thought that I should place it in a popular forum for a wider audience. I love watching the dolphins play with toroidal bubbles. Check out the blown bubbles rings at the end!
[video=youtube;mHyTOcfF99o]http://www.youtube.com/watch?v=mHyTOcfF99o&feature=fvwrel[/video]
[video=youtube;mHyTOcfF99o]http://www.youtube.com/watch?v=mHyTOcfF99o&feature=fvwrel[/video]