In short, the birds stand on one leg to conserve body heat.
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Instead officers say they're still checking drivers by getting them to do things like stand on one leg and walk in a straight line.
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However, the researchers did find that flamingoes prefer to stand on one leg far more often when they are standing in water than when standing on land, they report in the journal Zoo Biology.
The birds also likely alternate which leg they stand on to avoid one leg becoming too cold.
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