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 complete clutch of a blue tit. In some nests, some of the eggs are not sired by the female’s mate, but by an extra-pair male (typically a male breeding in the close neighbourhood).

Credit

Lotte Schlicht, 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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