That cost may be worth it for monarch butterflies because the benefit of being noxious to predators is so much more valuable, Whiteman says. Tina Hesman Saey is the senior staff writer and reports ...

In the case of orange-and-black butterflies, the viceroy has evolved a striking resemblance to the beautiful but foul-tasting monarch. The two are so similar that predators -- mainly birds ...

Butterflies are a common ... Without an abundance of milkweed plants, the monarch could go into decline, and someday become quite rare. If the viceroy looks to you a lot like the monarch, you ...