Degradation of rural and urban great tit song: testing transmission efficiency.

PLoS One · 2011 · PMC3236192 · PMID 22174781

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highly significantno p-value reported

Site and song type had a highly significant effect on all three quartiles of tail energy decline.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.