🚀 go-pugleaf

In article <c7lm+5g@lynx.unm.edu> egates@triton.unm.edu (EL GATES) writes:
>In article <1992Jul27.142023.28312@news.acns.nwu.edu> dsk@nwu.edu writes:

>>They were just breaking the surface from underwater, collecting a small bit
>>of air, and blowing it under water into perfect rings (similar to smoke rings.)
>>After the rings spun and grew and moved a bit, the whales would swim down and
>>bite part of the ring, or try to swim through it, until it collapsed.  Then
>>they went back to the surface, and did it again.

>I have no idea why whales do it or if it is common behavior, but I 
>have seen sea lions at the local zoo make bubble rings as well.

Some whales catch fish this way. They encircle part of shoal with a
rising ring of bubbles, and then charge up the middle of the ring with
their mouths wide open. I saw this on a TV wildlife film, in a
location famous for this behaviour at a certain time of year -- the
whales turn up at the right time for the fish harvest.
-- 
Chris Malcolm    cam@uk.ac.ed.aifh          +44 (0)31 650 3085
Department of Artificial Intelligence,    Edinburgh University
5 Forrest Hill, Edinburgh, EH1 2QL, UK                DoD #205