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June 5 2013
City living could have a major impact on the biological clocks of humans and animals, a new study has found.
Researchers measured the circadian rhythms - the 24-hour cycle of biological activity - of urban and rural blackbirds in southern Germany.
German and Scottish researchers found the city birds woke up earlier and rested less than forest dwelling birds.
The team has raised the possibility the differences could be the result of micro-evolutionary changes.
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