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To stay healthy, birds must consume 10,000 calories a day (equal to 155,000 cals in human terms). http://su.pr/1A54MN #birds #birding
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RD @nwf To stay healthy, !birds must consume 10,000 calories a day (equal to 155,000 cals in human terms). http://su.pr/1A54MN #birds
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