Walruses and whales also have penile bones, they are called ossicks and were once used as warclubs.
By the way, thanks for the link, pretty cool. I understand that whale cats (centopsis) also feed that way when they find a large carcass.
And they bite! There was an article in a New Guinea newspaper about two incidents about fishermen using nets being bitten by introduced black pacu. The fishermen were naked and were both bitten on the genitals, both died of shock and blood loss. Keep you pants on when swimming with pacu.
