Penis to Scale

Hall of Fame

The largest

1. North Pacific Right Whale: 2.33 m
2. Blue Whale: 2.25 m
3. African Bush Elephant: 1 m

The smallest

1. Penis-fencing Flatworm: 0.13 mm
2. Bed bug: 0.5 mm
3. Cowpea seed beetle: 0.86 mm

Largest relative to body

1. Greater Argonaut: 4.1 cm
2. Burrowing barnacle (dwarf male): 1.3 mm
3. Acorn Barnacle: 9.2 mm

The weirdest

1. Argentine Lake Duck: 22.3 cm
2. Mallard: 13.2 cm
3. Short-beaked Echidna: 7 cm