Killing with kindness: captive-bred migratory butterflies don’t migrate
Monarch butterflies (Danaus plexippus) reared commercially in North America fail to head south on the annual migration for which the species is famous, researchers from the University of Chicago have found.
Even those bred outdoors or raised indoors under migration-inducing conditions do not join in the annual autumn long distance flight, which sees millions of the insects moving from north-western Canada and the US to overwintering grounds in Mexico.
Published by Cosmos Magazine.
