The Migration of the Monarch Butterfly

Short Wave


On the show today. Migration there are many hundreds if not thousands of species of birds that migrate. there's caribou across canada wildebeest in africa. There are migratory fish like salmon and also a lot of marine animals migrate long distances like sea turtles and whales. But right now. Let's turn our attention to the humble but tenacious monarch butterfly. I think of monarchs is the tanks of the butterfly world. so they're small they way only a half a gram but they can travel thousands of kilometers in the wild. This is sonia. All tyzzer many colleges at the university of georgia so i study the ecology of animal migration and sonya says monarch butterflies are different because their migration is multi generational so the same monarch never makes the journey twice. It's their grand offspring and great grand offspring of the migratory generation that will migrate again the following year sonya's specifically talking about a migration path east of the rocky mountains. These monarchs travel thousands of miles across international borders every year. Ecologists think they're looking for the precious milkweed clamped in arguably the most important driver for them is food and especially milkweed plants where the females can lay their eggs. Another reason why they migrate is to ride out the winter in the sierra madre mountains near mexico city

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