How do you tell a monarch apart from a viceroy or other mimics?
It is easy to mistake a viceroy or other mimic for a monarch. Viceroy butterflies are commonly mistaken for monarchs. They are slightly smaller in size than monarchs, but their largest distinguishing feature is a thick black horizontal (when wings are open) stripe across both hind wings that is missing from monarchs. If you see that distinct stripe, it's a viceroy! The caterpillars and eggs look very different from immature monarchs. For more information about the differences between viceroys, monarchs, and other mimics, download the Monarch SOS app for Apple devices, or see this detailed description from Journey North.