Look closely at your backyard butterflies! Here's how to detect the subtle differences among the three butterflies that look like monarchs.

You might find a viceroy visiting your garden flowers in early summer. Occasionally one of these big, beautiful butterflies will visit your garden to take nectar, especially if you have milkweeds ...

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 ...