rocío sánchez: Monarch Butterfly

Monarch butterfly migration is the phenomenon, mainly throughout North America, where the monarch subspecies Danaus plexippus plexippus migrates each autumn to overwintering sites near the west coast of California or mountainous sites in central Mexico. Other populations from around the world perform minor migrations or none at all. This massive movement of butterflies has been recognized as "one of the most spectacular natural phenomena in the world".