Urban-based birds 'learn to rap'
Birds living in cities are performing a type of "avian rap" while their rural counterparts are sticking to more traditional sounds, a study shows.Dutch researchers found that urban species of birds sing short, fast songs rather than the slower melodies of countryside birds.
City birds also sing at a higher pitch and will try out different song types.
Experts said city birds have adapted to counter background noise and increase their chances of finding a mate.
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