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Why do the birds go on singing -- at night?
The common expectation (right up there with the sun rising in the east, leaves dropping in the fall, and the cat wanting back in as soon as someone has let it out) is that birds sing in the sunshine.
They're supposed to be early birds, right?
But across Fresno, Calif., and elsewhere, more-than-casual observers have noticed birds singing long after dark this summer.
Were the birds singing at night all along and people just now noticed?
Could mockingbirds -- those raucous late-night partiers of the bird world -- be mocking the sound of songbirds?
Could a cat with hunting prowess have moved into the neighborhood, keeping the birds awake at night? Or is it another sign of city life changing the natural world?
In England, researchers found that the British robin was forced to sing at night because daytime traffic was drowning out his mating serenades.
The study by Richard A. Fuller and colleagues at the University of Sheffield, published in 2007, measured noise levels and singing at 67 sites around their city. They found that birds sang only during the day at 49 sites, and day and night at 18 sites. Daytime noise levels at those 18 sites were significantly higher than at the others.
Originally posted by kupoliveson
In the city it is almost definitely caused by light but who knows maybe out where you are any changes in the radiation levels, magnetic fields, temperature changes, nutrition or health of the birds, could be responsible for increased stimulation of birds at night.
Originally posted by pieman
i've noticed it this year, i'm in ireland. i'm in quite a rural area so i'ld say it's not likely to be ambient noise or light levels either. i thought it was just me and i hadn't noticed it before now.