Birds know how to deal with urban noise pollution

The birds (blackbird) residing in the city tend to sing higher notes than their rural counterparts, the researchers say, those high-pitched sounds are to deal with the Noise pollution of urban traffic.

In this study, scientists from the Max Planck Institute in Germany tracked live birds in the city of Vienna as well as birds living on the outskirts of the city or locked in cages.

Bird safes in the city park

Analyzing the frequency and amplitude the researchers found that the birds could sing songs with amplitude and frequency greater than normal, helping them to sing larger. By actively selecting high-frequency sounds, urban birds increase their ability to sing loudly, against the negative effects of background noise to their songs, researcher Henrik Brumm dad.

This bird's strategy is just one example of how animals have adapted to the noisy life next to humans. Some red-necked birds waited for the night to come down, when the sparse vehicles gradually began to sing, Henrik said.

But even though far away from the city, noise from humans can become a serious problem for other animals. Among mammals that live in the sea, whales are known as the species with the greatest sound sensitivity with low-frequency cries.

Their songs play a very important role in mating and making friends that can be drowned out by the noise of sea traffic as well as the exploitation of energy. A 2010 North American study found that whales in this region increased their vocal volume as a result of increased noise pollution.