If you ever wanted to see a maggot crawl its way out of a flies ass, well we've got you covered. Filed under things I did not know , did not need to know, and things I did not ever want to know.... Tsetse fly gives birth to live young.
Essentially, it lets its eggs hatch within itself, and the growing maggot feeds off of "Milk" produced by its mother until it becomes big enough to crawl out on its on. Its first act is to pupate, and hatch into an adult fly.
It looks pretty uncomfortable, but at least the fly only has to do this once a week...
Found via wtfevolution.tumblr.com