Recently, bees have been added to the list in the U.S. for animals that have become endangered. This means that the number of bees has decreased so greatly and in such short time, that there are very few left. Only certain species or types of bees were actually put on that list. One on the list includes the Hawaiian yellow-faced bees. Animals become endangered for several reasons, but one could be that they were not protected.
These animals are killed quickly by chemicals because people do not want to be pestered by these animals and they swat and kill them when they see them flying around. Other threats included their destruction of their habitat as well as natural disasters like hurricanes.
Bees are one of the most important resources in the world—in fact, it has been studied and shown that if bees go extinct, humans will die out in about 4 years after because nothing will be pollinating our food. This begs the question how this important species became endangered. Truth is, humans have been careless over a number of years. We've used pesticides that are harmful to these insects in order to keep other bugs from our food and have contributed greatly to climate change.
These two factors are huge, but there are also parasites that can only reproduce in bee colonies as well as problems with disease in bee populations. Luckily, there have been recent movements to save the bees and people learning the art of beekeeping both for honey and helping these insects.