Magic rings

**dig deep** · 13-09-2008

Code:

http://rapidshare.com/files/144971530/Blowing.wmv.html

The attached video is of dolphins playing with silver water rings which they have the ability to make under water to play with. It isn't known how they learn this, or if it's an inbred ability.

As if by magic the dolphin does a quick flip of its head and a silver ring appears in front of its pointed beak. The ring is a solid, donut shaped bubble about 2-ft across, yet it doesn't rise to the surface of the water! It stands upright in the water like a magic doorway to an unseen dimension. The dolphin then pulls a small silver donut from the larger one. Looking at the twisting ring for one last time a bite is taken from it, causing the small ring to collapse into a thousands of tiny bubbles which head upward towards the water's surface. After a few moments the dolphin creates another ring to play with. There also seems to be a separate mechanism for producing small rings, which a dolphin can accomplish by a quick flip of its head.

An explanation of how dolphins make these silver rings is that they are "air-core vortex rings". Invisible, spinning vortices in the water are generated from the tip of a dolphin's dorsal fin when it is moving rapidly and turning. When dolphins break the line, the ends are drawn together into a closed ring. The higher velocity fluid around the core of the vortex is at a lower pressure than the fluid circulating farther away. Air is injected into the rings via bubbles released from the dolphin's blowhole. The energy of the water vortex is enough to keep the bubbles from rising for a reasonably few seconds of play time.

Very strange and funny animals

**rolfw** · 13-09-2008

Intriguing, an excellent video.

**freddy** · 13-09-2008

Incredible; a must see, Where was it recorded?

many thanks

**Topper** · 14-09-2008

Originally Posted by freddy

Incredible; a must see, Where was it recorded?

Under water

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Magic rings Discuss your wife's objections to the fifth dish going up or your concern that there's far too little violence on the box these days. You can also introduce yourself here or just chat about anything. Remember, no keys or files allowed.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)