Friday, April 27, 2007

interesting though

Some time ago (see December 2006) I posted the idea that Great Tits sing both faster and at higher pitch in order to communicate in their noisey urban environments. Now it seems that Robins have adapted also - but in a different way. Research from the University of Sheffield has shown that Robins make an active decision to sing at night, when noise levels are lower, rather than be out-competed by trucks and cars etc during the day.
Often trotted out is that birds sing at night because of the effects of light-pollution, tricking them into a longer 'day' with singing at night. Researchers tested nocturnal light and daytime noise as variables and found that daytime noise had a stronger effect on behaviour than nighttime light.
So my next question is: what influences Blackbirds to sing at night, while Mistle Thrushes still persist in singing as loud as possible during the day? Have they adapted in some way?
Image taken from: bbc.co.uk/news

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