Change in Sex Ratio in an African Butterfly

@article{Owen1965ChangeIS,
  title={Change in Sex Ratio in an African Butterfly},
  author={Denis F. Owen},
  journal={Nature},
  year={1965},
  volume={206},
  pages={744-744}
}
IN butterflies, the sex ratio is 1 : 1, or nearly so. Random collections often show a slight excess of males over females, because males are the more active and hence are more often seen and collected.