Monarch Butterfly Migration
1
Monarchs cluster together for warmth in a Mexican overwintering site. (Credit: Jaap de Roode)
2
Monarchs take to the sky in Mexico. (Credit: Sonia Altizer)
3
Monarch butterflies catching the sun on an oyamel tree in a Mexican overwintering site. (Credit: Jaap de Roode)
4
A monarch butterfly about to emerge from its chrysalis. (Credit: Jaap de Roode)
