A Monarch butterfly is a fairly large butterfly. Its wings are orange with black veins. The edges of its wings are black with small white spots. From edge-to-edge, when its wings are spread, the butterfly is between 3.5" to almost 5" across! When seen from the top and bottom, its wings are orange. The female is a brighter orange while the male is more brownish.
It is easy to differentiate male from female. See if you can spot the difference.
Now that you have seen pictures of a girl and a boy Monarch, you are going to take a Monarch test. Are you ready?
What gender do you think this butterfly on my hand is?
Many people often mistake the Gulf Fritillary for a Monarch. Here is a Gulf Fritillary (Agraulis vanillae). How does it look like a Monarch? (both are orange, both have black veins, both have black markings…). If you were to measure the two, you would find that the Monarch is a much LARGER butterfly overall. Even the caterpillars look different. Plus, Monarchs use plants in the Milkweed family (Asclepias spp.) as their host plant where Gulf Fritillaries use Passionvines/Passionflowers (Passiflora spp.) as their host plant.
Okay, here's your last test. In this picture, see if you can identify the Monarch and the Gulf Fritillary.