The largest
From the Hall of Fame
Longest first, going by typical adult length rather than records.
- North Pacific Right Whale Eubalaena japonica: 2.33 m
- Blue Whale Balaenoptera musculus: 2.25 m
- African Bush Elephant Loxodonta africana: 1 m
- Bull (domestic cattle) Bos taurus: 90 cm
- Giraffe Giraffa camelopardalis: 77 cm
- Greater One-horned Rhinoceros Rhinoceros unicornis: 65 cm
- Pacific walrus (baculum) Odobenus rosmarus divergens: 55.9 cm
- Horse (stallion) Equus caballus: 50 cm
- Lowland tapir Tapirus terrestris: 49 cm
- Pig (boar) Sus scrofa domesticus: 47.5 cm
- Ostrich Struthio camelus: 30.1 cm
- Argentine Lake Duck Oxyura vittata: 22.3 cm
- Chimpanzee Pan troglodytes: 14.4 cm
- Mallard Anas platyrhynchos: 13.2 cm
- Human Homo sapiens: 13.1 cm
- Common bottlenose dolphin Tursiops truncatus: 12.1 cm
- Domestic Dog Canis familiaris: 11.7 cm
- Komodo Dragon Varanus komodoensis: 10.5 cm
- Slender Banana Slug Ariolimax dolichophallus: 8.5 cm
- Short-beaked Echidna Tachyglossus aculeatus: 7 cm
- Western gorilla Gorilla gorilla: 7 cm
- Giant-sperm fruit fly (sperm, not a penis) Drosophila bifurca: 5.8 cm
- Leopard Slug Limax maximus: 4.1 cm
- Greater Argonaut Argonauta argo: 4.1 cm
- Serotine Bat Eptesicus serotinus: 1.6 cm
- Acorn Barnacle Balanus glandula: 9.2 mm
- Spider (male palp): electric-blue tarantula Chilobrachys natanicharum: 8 mm
- Domestic Cat Felis catus: 7.5 mm
- Red-sided Garter Snake Thamnophis sirtalis parietalis: 6.9 mm
- Guppy Poecilia reticulata: 3.8 mm
- Burrowing barnacle (dwarf male) Cryptophialus minutus: 1.3 mm
- Cowpea seed beetle Callosobruchus maculatus: 0.86 mm
- Bed bug Cimex lectularius: 0.5 mm
- Penis-fencing Flatworm Pseudoceros bifurcus: 0.13 mm
Also: The smallest · Largest relative to body · The weirdest