I was in Half-Price books yesterday and happened to pick up a copy of
Neville Coleman's "Shells Alive".  He documented something that I think is
remarkable.  Over a period of a few hours two male Cassis cornuta first
moved toward and then combined to excavate out another male that had
tipped over and was stuck in the sand.  Further the males used their
weight to flip over the sticken male.  This seems to be remarkable
behaviour; any ideas what biological rational this might provide an
advantage?  Any other examples of this type of behaviour?

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