Retitling this video based on an explanation of the behavior of these amazing critters. Thanks to Richard Ross via Vimeo for this information:
"What is going on in the vid is breeding competition and actual breeding. The largest animal is the female (often donning 'drab' colors) and the other two are males. The larger male is trying to stop the smaller male from mating with the female, and being gentle about it.
There is often a more spectacular color show with males doing this, with a lot of white coloration, and perhaps it does not occur in your video because the smaller male is so much smaller.
The part that you questioned as being 'regurgitating' was the actual mating - the female rolling her arms back is a known mating position. It looks like both males deposit spermataphores."
Music: Angels of the Deep by John Grout
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