Female aphids don't need males to reproduce. Their trick is called "parthenogenesis" and means big savings in time and energy.
In 2001 a shark was born at a zoo in Nebraska. The birth might not have been newsworthy, except that baby appeared in a tank with three female sharks.
In fact, one of the defense mechanisms of these insects, crypsis, involves their taking their resemblance to twigs as far as it will go.