Specimen No. 026 · Bird

Roman Goose penis size & anatomy

Anser anser domesticus

Reference measurement

Approx. 11.9 cm / 4.7 in

Representative estimate

Study reported treatment-group means from 8.72 to 15.2 cm; simple average of the eight reported group means used for calculator.

Measured penis lengths across study groups ranged from about 8.7 to 15.2 cm.
Source: PMC / Poultry Science (opens in a new tab)
Unlike most birds, geese are among the bird groups that retain a phallus.
Source: PLOS ONE (opens in a new tab)
Bird phalluses use a lymphatic rather than blood-vascular erection mechanism.
Source: Oxford Academic (opens in a new tab)