Lady flies can decide who will father their young

Females in the animal kingdom have many methods available to them to help bias male paternity. One such process is displayed by Euxesta bilimeki, a species of Ulidiid fly, whose females expel and then consume male ejaculate after copulation. A new study by Christian Rodriguez-Enriquez and his colleagues from the Instituto de Ecologia in Mexico has been researching the possible reasons why the female of this species might adopt this behavior. Their study is published in the Springer journal Behavioral Ecology and Sociobiology.

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