Change in beak overhangs of cliff swallows over 40 years: Partly a response to parasites?
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DOI: 10.1371/journal.pone.0263422
Abstract: Some birds exhibit a maxillary overhang, in which the tip of the upper beak projects beyond the lower mandible and may curve downward. The overhang is thought to help control ectoparasites on the feathers. Little… read more here.
Keywords: response; extent maxillary; cliff; cliff swallows ... See more keywords