Morphological change to birds over 120 years is not explained by thermal adaptation to climate change.

PLoS One · 2014 · PMC4096916 · PMID 25019159

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a decreasing trendno p-value reported

Where there were significant fluctuations in tarsus length over time or with temperature, they did not necessarily support the a priori hypothesis of a decreasing trend.

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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.