Monarch butterflies with a heavy load https://www.mpg.de/592464/pressRelease20090724?filter_order=L
Scientists have succeeded for the first time in fitting monarch butterflies with a radio transmitter and in tracking them from an aircraft over a long distance on their flight northwards during the butterflies’ annual migration from their winter residence in Mexico
Wikelski, biologist at the Max Planck Institute for Ornithology in Radolfzell and professor