Specimen No. 001 · Marine Mammal

Blue Whale penis size & anatomy

Balaenoptera musculus

Reference measurement

Approx. 2.74 m / 9 ft

Representative estimate

Calculator value is midpoint of Smithsonian's commonly cited 8–10 ft range; true species average is difficult to establish.

The penis is normally concealed inside the body and extends through the genital slit.
Source: Smithsonian Magazine (opens in a new tab)
Blue whales are the largest animals known to have lived.
Source: PubMed / Comparative Biochemistry and Physiology (opens in a new tab)
Like other cetaceans, blue whales do not have an external scrotum; the testes are internal.
Source: PLOS Biology (opens in a new tab)