type="html">Barnacles have the longest penis in relation to body size of any animal: the organ is ten times its height.As adults, barnacles cement themselves to rocks and are unable to move. The barnacle unfurls its long penis which roves around to find a partner, leading to jousting matches between neighbouring male barnacles.
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As adults, barnacles cement themselves to rocks and are unable to move. The barnacle unfurls its long penis which roves around to find a partner, leading to jousting matches between neighbouring male barnacles.