Monarch butterflies are known for the incredible mass migration that brings millions of them to California and Mexico each winter. North American monarchs are the only butterflies that make such a massive journey—up to 3,000 miles (4,828 kilometers). The insects must begin this journey each fall ahead of cold weather, which will kill them if they tarry too long.
Average life span in the wild: Up to 6 to 8 months
Size: Wingspan 3.7 to 4.1 in (9.4 to 10.5 cm)
Weight: .0095 to .026 oz (.27 to .75 g)
Group name: Flutter
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