The Monarch Butterfly or simply Monarch is a Milkweed butterfly in the family Nymphalidae. Other common names depending on region include milkweed,common tiger,wanderer,and black veined brown.It may be the most familiar North American butterfly.Monarchs are known for their long annual migration. In North America, they travel long distances South in the Fall,and North in the Spring. No single individual makes the whole trip.The Monarch is famous for its southward migration and northward return in Summer.