Wikipedia:Good articles/Monarch butterfly

The monarch butterfly (Danaus plexippus) is an insect in the Nymphalidae family. It is the best-known butterfly in North America. Monarchs are known for their long annual migrations. In North America, they travel long distances south in the fall, and north in the spring. They start to migrate south in about August. They must get to frost-free areas. Freezing will kill them. A migration towards the north starts in the spring.