The monarch butterfly or simply monarch  (Danaus plexippus) is a milkweed butterfly  (subfamily Danainae) in the family Nymphalidae.[6] Other common names, depending on region, include milkweed, common tiger, wanderer, and black-veined brown.[7] It is among the most familiar of North American butterflies and an iconic pollinator,[8] although it is not an especially effective pollinator of milkweeds.[9] Its wings feature an easily recognizable black, orange, and white pattern, with a wingspan of 8.9–10.2 cm (3.5–4.0 in).[10] A Müllerian mimic, the viceroy butterfly, is similar in color and pattern, but is markedly smaller and has an extra black stripe across each hindwing.