It's called convergent evolution. When you have a good idea, you stick with it.

BIOLOGY
One cell of this fish can express one of 5000 possible shades.
Only about 10 percent of people are left-handed. If you’re one of them, you're part of a rare and special group.
The discovery may change the way the infections are treated.
At only 3 inches long and weighing about 60 grams, the uterus isn’t a flashy, attention-grabbing organ. But it is pretty amazing.