Penis to Scale

Largest relative to body

From the Hall of Fame

Penis length as a share of body length. An animal needs a sourced body length to get on this list.

  1. Greater Argonaut Argonauta argo: 4.1 cm 4.5× its body length
  2. Burrowing barnacle (dwarf male) Cryptophialus minutus: 1.3 mm 4.2× its body length
  3. Acorn Barnacle Balanus glandula: 9.2 mm 1.2× its body length
  4. Bull (domestic cattle) Bos taurus: 90 cm 59.9% of its body length
  5. Argentine Lake Duck Oxyura vittata: 22.3 cm 54.9% of its body length
  6. Slender Banana Slug Ariolimax dolichophallus: 8.5 cm 51.5% of its body length
  7. Horse (stallion) Equus caballus: 50 cm 31.9% of its body length
  8. Pig (boar) Sus scrofa domesticus: 47.5 cm 31.3% of its body length
  9. African Bush Elephant Loxodonta africana: 1 m 27.7% of its body length
  10. Leopard Slug Limax maximus: 4.1 cm 27.5% of its body length
  11. Cowpea seed beetle Callosobruchus maculatus: 0.86 mm 26.5% of its body length
  12. Mallard Anas platyrhynchos: 13.2 cm 24.9% of its body length
  13. Lowland tapir Tapirus terrestris: 49 cm 24% of its body length
  14. Serotine Bat Eptesicus serotinus: 1.6 cm 22.8% of its body length
  15. Guppy Poecilia reticulata: 3.8 mm 22.7% of its body length
  16. Spider (male palp): electric-blue tarantula Chilobrachys natanicharum: 8 mm 20.8% of its body length
  17. Pacific walrus (baculum) Odobenus rosmarus divergens: 55.9 cm 17.5% of its body length
  18. Chimpanzee Pan troglodytes: 14.4 cm 16.6% of its body length
  19. Short-beaked Echidna Tachyglossus aculeatus: 7 cm 16.5% of its body length
  20. Greater One-horned Rhinoceros Rhinoceros unicornis: 65 cm 15.8% of its body length
  21. North Pacific Right Whale Eubalaena japonica: 2.33 m 14.3% of its body length
  22. Giraffe Giraffa camelopardalis: 77 cm 14% of its body length
  23. Blue Whale Balaenoptera musculus: 2.25 m 10% of its body length
  24. Bed bug Cimex lectularius: 0.5 mm 9.4% of its body length
  25. Human Homo sapiens: 13.1 cm 7.7% of its body length
  26. Western gorilla Gorilla gorilla: 7 cm 6.7% of its body length
  27. Red-sided Garter Snake Thamnophis sirtalis parietalis: 6.9 mm 1.5% of its body length
  28. Domestic Cat Felis catus: 7.5 mm 1.4% of its body length
  29. Penis-fencing Flatworm Pseudoceros bifurcus: 0.13 mm 0.31% of its body length

See the ranking with pictures

Also: The largest · The smallest · The weirdest