Intelligent Design

Japanese researchers learned recently that a species of sea slug may lose its penis after copulating, but then grow another one and use it when the occasion arises. Writing in British journal Biology Letters, the scientists reported slugs have both male and female organs and, in effect, copulate with each other through a simultaneous hook-up. The team’s final breathtaking finding: A sea slug’s penis can remove competitors’ sperm from its mate’s female openings.

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