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Birds 'weigh' peanuts and choose heavier ones

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Many animals feed on seeds, acorns or nuts. The common feature of these are that they have shells and there is no direct way to know what's inside. How do the animals know how much and what quality of food is hidden inside? A simple solution would be to break the shells, which often takes time and effort—it would be a big disappointment to know that it's rotten or bad after the hard effort of opening the nuts!


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