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Originally Posted by Locobot
Birds seem to be a bit of a gray area, some lay their eggs in other's nests but this could possibly be analogous to parent's sending their children away during wartime.
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Is this not so they don't have the duty to look after their offspring and can go on living their lives and produce more with the need to teach them all the ways of birdness. I would see it more as sending a child to school? In that case their 'pain' of losing their offspring is non existant because they know they are being better looked after. This is assuming birds understand alot and have strong emotions which in reality is unlikely so I would assume its just a natural occurance which evolution has brought about.