Dolphin play

[owlice]

So glad they haven't told us "So long!" (yet...!); otherwise, we couldn't see this: http://wimp.com/dolphinbubbles/

[Orca]

Wow, that is really cool, especially that it appears to be learned behavior passed along to the uninitiated.

[owlice]

The rings are "air-core vortex rings," according to this page.



Here's another video:

Click to play embedded YouTube video.

And whales can blow them, too!

[neufer]

[list]It all seems so porpoiseless. [/list]

<<For many porpoises a ring vortex may be approximated as having a vortex-core of small cross-section. However a simple theoretical solution, called Hill's spherical vortex, is known in which the vorticity is distributed within a sphere (the internal symmetry of the flow is however still annular). Such a structure or an electromagnetic equivalent has been suggested as an explanation for the internal structure of ball lightning. For example, Shafranov used a magnetohydrodynamic (MHD) analogy to Hill's stationary fluid mechanical vortex to consider the equilibrium conditions of axially symmetric MHD configurations, reducing the problem to the theory of stationary flow of an incompressible fluid. In axial symmetry, he considered general equilibrium for distributed currents and concluded under the Virial Theorem that if there were no gravitation, a bounded equilibrium configuration could exist only in the presence of an azimuthal current.>>

[owlice]

Neufer!!!

Back to whales... here's a pic of a Beluga playing with a ring. Boy, is he cute!!

[Beyond]

[list]It all seems so porpoiseless. [/list]

<<For many porpoises a ring vortex may be approximated as having a vortex-core of small cross-section. However a simple theoretical solution, called Hill's spherical vortex, is known in which the vorticity is distributed within a sphere (the internal symmetry of the flow is however still annular). Such a structure or an electromagnetic equivalent has been suggested as an explanation for the internal structure of ball lightning. For example, Shafranov used a magnetohydrodynamic (MHD) analogy to Hill's stationary fluid mechanical vortex to consider the equilibrium conditions of axially symmetric MHD configurations, reducing the problem to the theory of stationary flow of an incompressible fluid. In axial symmetry, he considered general equilibrium for distributed currents and concluded under the Virial Theorem that if there were no gravitation, a bounded equilibrium configuration could exist only in the presence of an azimuthal current.>>

Porpoiseless Seems to me that it is rather PORPOISEFULL And can be a whale of a good time also

[Beyond]

Owlice - it seems like you fly through some very interesting places sometimes

[owlice]

beyond, ofttimes, the interesting places come to me!