Ask the Expert: February 25 - March 11
Meet Dr. Karen Oberhauser, monarch butterfly expert and conservationist extraordinaire. She's pictured here while on a field trip in northern Mexico. Soon monarchs will be flying across this region on their spring migration. Somewhere in this week's update, Karen shares a secret about how monarchs can survive the winter without food in Mexico. Can you find it?

• Beginning Friday, you're invited to submit your questions about monarchs here.