Specimen No. 019 · Rodent
Brown Rat penis size & anatomy
Rattus norvegicus
Reference measurement
Approx. 10.9 mm / 0.43 in
Published average
Adult control Wistar rats in study averaged 10.94 ± 0.22 mm.
Measurement source: ScienceDirect / Toxicology (opens in a new tab)
Did you know?
Adult control rats in one study averaged about 10.94 mm in penis length.
Rats possess a baculum, or penis bone.
Source: Journal of Animal and Veterinary Advances (opens in a new tab)
Adult rat bacula are reported at roughly 5.5–7.0 mm long.
Source: Journal of Animal and Veterinary Advances (opens in a new tab)