i'm almost at summit of bald peak, and you can tell — i'm quite out of breath.‘s thin, it's quite cold, but we are beginning to see monarch butterflies. every winter, millions of butterflies fly for around two months from canada and the us to a few patches of high—altitude forest here in mexico. most are located in the state of michoacan, but this place is slightly east of there, in mexico state. cerro pelon is the least touristy site, and somewhere you can truly be alone with these creatures. wow! normally we're not allowed to get this close but, from this distance, i hope you can see there are millions of monarchs clustered in black clumps on these fir trees. what i find absolutely amazing about this insect is they travel 4,000km from canada, the united states, down to this particular forest. it's the longest migration undertaken by any insect. scientists only recently discovered that they use the sun to navigate to the same reserves every year, where they rest, feed, and then find a mate. in recent years, the populations have dwindled, thanks to the destructi