Environment
A Strange Cloud Over St. Louis Turns Out to Be an Enormous Swarm of Butterflies
In a weird twist, the swarm itself resembles a huge butterfly.
Late last week, meteorologists in St. Louis noticed a cloud acting peculiarly: It was beating a path toward Mexico while changing into a variety of odd shapes. Was it a radar glitch? The debris signature of a south-moving tornado?
The answer was more heartening—and bizarre. After analyzing the reflections, the National Weather Service concluded they showed an immense swarm of Monarch butterflies migrating to their winter home in the Mexican mountains: