This is the third installment of the occasional series Thank God It’s Penis Friday. The first was on banana slug sex; the second on Iceland’s Phallological Museum.
Today we are going to talk about penis bones. The penis bone, or baculum, is the supportive bone in the penises of most mammals. Relax, you didn’t miss anything: humans are among a minority of mammals that don’t have one. Mice, rats and all the other rodents have tiny bacula in their tiny penises. So do bats, shrews and moles; all the carnivores (bears, lions, weasels, dogs, cats); their aquatic relatives the seals, sea lions, and walruses; and nearly all primates, not excepting our close relatives the chimpanzees and gorillas.
The baculum sits in the tip, or glans, of the penis and ranges in size from a few millimeters in gorillas and mice to a quite serviceable 3 inches in larger dogs. And then there’s the somewhat disturbing two-foot long baculum of the walrus. The Internet is rife with mentions of this natural wonder, but nobody says much except that it’s really, really big.







