The forest was blanketed in butterflies. Huge, dark green pine trees looked like oaks in fall, covered in shades of orange and yellow. The air was so thin, it hurt to breathe, and the silence was so complete, my own breathing sounded loud enough to frighten the butterflies away. Entering a world of monarchs in Michoacan, Mexico can only be described as jaw dropping. Monarch expert Dr. Lincoln Brower, Research Professor of Biology at Sweet Briar College, says the actual number of monarchs that migrate to Mexico each fall is unknown, but he estimates more than a billion make the amazing journey.