Have you ever stopped to wonder how scientists learn about things like butterfly migration patterns? After all, it's not like they can just sit down and ask butterflies where they go. They tried; the butterflies refused to talk. That's where researchers like Rachel Comp come in. She works for the Grand Canyon National Park in Arizona. Her job is to catch monarch butterflies and tag their wings. Once tagged, the researchers can track butterfly migration patterns to see how things like climate change affect those patterns.