Birds sing louder in noisy environments
25 April 2004 - A study conducted at the Free University of Berlin showed that city birds sing louder than country birds. Behavioral biologist Henrik Brumm concluded that male birds in urban environments try to compensate for high noise levels by singing louder so that their female counterparts can hear them. In this way, the birds adapted to their surroundings and they did it in a very flexible way. On weekends, when there was less traffic flow, they sang at lower frequencies. Cities aren
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