Check out the similarity between the Monarch and Viceroy; they are very very close... but... the Viceroy has that line across the rear wings- the Monarch doesn't! A very common ID error.
The monarch is toxic to birds (gets the toxins from the milkweed the caterpillars eat), but the Viceroy isn't. It mimics the Monarch so the birds won't eat it.
Monarch:
http://bugguide.net/index.php?q=search&keys=Monarch&search=Search
Viceroy:
http://bugguide.net/index.php?q=search&keys=Viceroy&search=Search
This is definitely a Viceroy. The black line through the wings is the identifier. Male and female monarchs do not have this continuous line. Male monarch have small black scent marks their hind wings, female monarchs do not.
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