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Résumé :
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Excerpt In order that a place may be suitable for an animal to live in, it should be able to satisfy all its essential requirements. It should be a habitat where the animal can feed, hide, sleep and breed all within easy reach of its cruising radius. A habitat becomes suboptimal or marginal when one or more of these requirements are only just fulfilled. No animal can live in a place where the fulfilment of one of them is wanting. Seeds of plants and the diaspores of many lower animals are usually dispersed in large numbers over all sorts of places, inhabitable as well as uninhabitable ones. Only those individuals which have the good luck of arriving in a suitable place have a chance to survive. All others are doomed to perish. In higher animals, such as birds, which are less lavish with their offspring, the young are not passively dispersed,...
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