Wild mallards have more "goose-like" bills than their ancestors: a case of anthropogenic influence?

PLoS One · 2014 · PMC4267828 · PMID 25514789

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only marginally significantno p-value reported

difference between historical wild and present-day wild females only marginally significant) and historical wild mallards also had the narrowest bills whereas farmed birds had the widest.

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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.