Hammerhead Shark Has “Virgin Birth"

A lot of people think of virgin birth as a once-in-a-millennium sort of thing, if that. But it's not as uncommon as you may think, according to this Florida Sun Sentinel story:

_A hammerhead shark captured in Florida Bay gave birth without sex, according to scientists who said they used genetic analysis to account for the mysterious appearance of a pup in a tank of female sharks.

The phenomenon, known among biologists as a "virgin birth," had been observed before among some snakes, lizards and birds, but never a shark, the scientists say._