Older males out-compete young males when it comes to extra-marital breeding (IMAGE)

PLOS

Older males out-compete young males when it comes to extra-marital breeding

Caption

A female blue tit on her nest. Many females copulate not only with their own social partner, but also with one or more extra-pair sires. Under natural circumstances, these extra-pair males are typically older, experienced males and rarely one-year-old males.

Credit

Kaspar Delhey, MPIBI (CC-BY 4.0, https://creativecommons.org/licenses/by/4.0/)

Usage Restrictions

Credit must be given to the creator.

License

CC BY

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