The fish schooling vertical axis windmill grouping paper is out on arxiv.org
http://arxiv.org/abs/1002.2250 The other paper from Nature http://www.nature.com/nature/journal/v463/n7282/abs/nature08736.html titled "Competition drives cooperation among closely related sperm of deer mice" notes that "By forming cooperative groups, sperm can increase their swimming velocity and thereby gain an advantage in intermale sperm competition" which only leaves the question of how the sperm identify their brothers. -- rec --
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