"Beak size" refers to the length and shape of a bird's beak. It describes the size or dimensions of the beak, which is an important characteristic for different bird species. Full definition
Variants of one gene had a major effect on rapid changes in beak size after a drought, researchers report in the April 22 Science. (sciencenews.org)
Averaged across all species, temperature explained 16 per cent of beak size variation (The American Naturalist, DOI: 10.1086 / 653666). (newscientist.com)
Genetic variants of the HMGA2 gene controls beak size in the birds, evolutionary geneticist Leif Andersson and colleagues now report. (sciencenews.org)