One of the new natural wonders is only an hour north of bustling Mexico City. The World Wildlife Fund （WWF） has been active in the conservation and protection of the monarch butterfly in North America and with that goal in mind offers trips to the UNESCO-designated Monarch Butterfly Reserve. These are in partnership with the ecotourism operator Natural Habitat Adventures （NHA）. Deeming the reserve to be a "critical link" in the preservation of Monarch butterflies, WWF and NHA have arranged several departures from January through March with their "Monarch Butterflies of Mexico" itinerary which promises "hundreds of thousands of Monarch butterflies carpeting Mexican forests, blanketing trees and filling the air with a symphony of fluttering wings."