Putting tiny backpacks on butterflies—for science

How do you track the movements of the majestic monarch butterfly (Danaus plexippus)? By giving each bug a solar-powered radio backpack, of course. The orange, black, and white polka-dotted pollinators are native to North America, and can be found in more than 90 countries, islands, and island groups. They exist everywhere there is milkweed, which is the only thing that their caterpillars feed on. There are both migratory and non-migratory populations, and the migratory monarch butterfly (Da