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The Longest Relative Penis in Nature
Barnacles have penises up to 8 times their body length — the longest ratio of any animal on Earth.
Barnacle
Cirripedia
These crustaceans cement themselves to rocks and ships, unable to move. This has led to some creative reproductive adaptations.
Vital Stats
🏷️ TypeCrustacean (related to crabs and lobsters)
🌍 Found InOceans worldwide — attached to rocks, ships, whales, and other surfaces
📏 Size0.5-7cm depending on species
⏳ Lifespan5-10 years
💕 Mating SystemHermaphroditic (have both male and female organs)
📅 Mating SeasonYear-round in warm waters
👶 OffspringThousands of larvae released per mating
🍆 Penis Size20 cm
⏱️ Sex Duration30 seconds
🔬 Notable AnatomyPenis up to 8x body length — longest relative to body size of any animal
⚖️ Sexual DimorphismN/A — hermaphrodites