RICHARD R.HANSEN / SCIENCE PHOTO LIBRARY RICHARD R.HANSEN / SCIENCE PHOTO LIBRARY
Monarch butterflies. View of several monarch butterflies (Danaus plexippus) resting together during their migration. Monarch butterflies are found throughout North America, and every autumn millions of monarchs head south to spend the winter in semi-hibernation in the warm southern USA and northern Mexico. They spend this period congregated in their millions on pine and eucalyptus trees. They mate in spring, and lay their eggs during their return flight northwards. These eggs hatch, and the adults continue the northern flight.
Model release not required. Property release not required.