In early February I traveled to central Mexico (the village of Ocampo, near Morelia) to the Oyamel Fir forests where the Monarch butterflies over winter. I wanted to visit this place, because it represents the closest equivalent to how I imagine the eel migration works, but above water (also working on a children's picture book that involves monarchs). An incredible aggregation of creatures that come from all over a continent to a very localized area to spend a season, and then reproduce. In terms of numbers, it's equivalent to piling the human population of Mexico on the soccer stadium in Mexico City. We saw what is estimated to be 150 million monarchs in a 5 acre area.