In the 1990s, beekeepers started recording major losses of worker honeybees during the winter months. Since then, there have been mass die offs in many of the other 4,000 species of bees. In 2006, the phenomenon was bestowed with the name colony collapse disorder. No one is exactly sure why the bees are dying off in unprecedented numbers, but some theories include the loss of flower meadows, varroa mites that eat the bees’ blood, climate change, and the use of pesticides. Thankfully, bees are a long way from becoming extinct. Which is good, because as this list shows, it could be disastrous for humanity.