We grow those, too. Here's a batch of foo fighter eggs waiting to hatch. You haven't seen anything until you've seen a pair of flying saucers trying to mate!
The male foo starts shooting probe missiles at the female foo. The female does her best to catch them all. Sometimes the male foo is so excited, the probe missiles shoot all over the place. It's best to watch from far away, with a telescope.
This is also why their flight is so ziggy-zaggy, especially during mating season. The male foos are always trying to shoot probe missiles into the female foos, but unless it's mating season, the females are out to dodge the mess.
It's best to keep the female foos separate from the male foos if you want to get any serious work done!