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. 2021 Mar 9;11:5463. doi: 10.1038/s41598-021-85068-x

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Assortative mating by telomere length (A) and age (B) in the blue-footed booby. In (A) each pair is represented by a point and the plotted trendline controls for other variables in the model (age and assay). In (B) the area of circle is proportional to the number of pairs with these ages. The assortment by telomere length is stronger than for age, despite many young pairs mated together.