Monarch butterflies (Danaus plexippus) are renowned for their North American migration. They are one of only two insect species known to make long-distance, bidirectional migrations (the other is the Bogong moth Agrotis infusa). Nevertheless, other Danaus species are described to exhibit some amounts of “migratoriness”. In order to understand how monarchs evolved this unique ability, we take a comparative approach to understand the capabilities of other Danaus species.
