Specimen No. 013 · Primate
Hamadryas Baboon penis size & anatomy
Papio hamadryas
Reference measurement
Approx. 12.3 cm / 4.8 in
Published average
2025 captive-colony study: mean stretched penile length 123.11 mm, range 64–172 mm.
Measurement source: MDPI Veterinary Sciences (opens in a new tab)
Did you know?
A recent study measured a mean penile length of 12.31 cm in male hamadryas baboons.
The same study measured the baculum, or penis bone, by X-ray.
Penile measurements were standardized using gentle traction and a fixed weight.