Back to this week's update.

Only 400 Miles to Fly!
"They're here! A migration like this I haven't seen in a decade," Rocio Trevino reported on Wednesday from her home in the northern state of Coahulia. "All day yesterday saw thousands of monarch throughout the city of Saltillo. Before dark they were flying low, looking to spend the night. This morning, though temperatures barely reached 16°C at 7 am, the butterflies began to rise from their perches. From 8 to 10:30 am they were on their way south, aided by the north wind blowing and announcing the entrance of cold front No. 7. Today, butterflies gave a beautiful performance in the entire metropolitan area of Monterrey."

Monarch migration map: Higlights of the Week