This is late(from 1986, to be specific), but it is an excellent documentary about how co-operation can come about in the natural world as long as it is of benefit to the "Selfish Gene".
[media]http://www.youtube.com/watch?v=x6rgWzYRXiI[/media]
[media]http://www.youtube.com/watch?v=x-PbzWBJMyY&feature=related[/media]
[media]http://www.youtube.com/watch?v=SIOF9PbdTLY&feature=related[/media]
[media]http://www.youtube.com/watch?v=ajbw4ilXbBU&feature=related[/media]
[media]http://www.youtube.com/watch?v=kphEhr2fRhw&feature=related[/media]
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