What is the maximum known length for the male walrus baculum, or penis bone?
Answer
63 cm (25 inches)
Internally, male walruses possess a significant accessory feature known as the baculum, which is the penis bone. This structure is remarkably developed, with documented lengths reaching up to $63 ext{ cm}$ ($25 ext{ inches}$). This dimension makes the walrus baculum notable for being the largest among all land mammals, both when considered in absolute measurement and when scaled relative to the animal's overall body mass. This large internal structure is part of the suite of features vital to the species' specialized existence.
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