Specimen No. 037 · Reptile
American Alligator penis size & anatomy
Alligator mississippiensis
Reference measurement
Approx. 70.3 mm / 2.8 in
Published average
Anatomical study of four adult/subadult specimens reports mean shaft length 70.29 ± 17.68 mm; observed 26.95–112.57 mm.
Measurement source: The Anatomical Record (opens in a new tab)
Did you know?
The measured alligator specimens averaged about 7 cm in penile shaft length.
The alligator penis is permanently stiff rather than inflating with blood during erection.
Muscles evert the organ, while elastic tissues pull it back into the cloaca.