The rising level of noise
in urban areas may be preventing some species of songbirds from setting
up home in large cities.
More than half of the world's population lives in urban areas, which is having an impact on wildlife.
Canadian researchers found that noisy surroundings masked the
lower frequencies of bird songs, affecting the way some species
communicated.
Unable to hear all elements of a song, females could perceive singing males as ill-suited mates, they added.
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