Come September, up to 300 million monarch butterflies in southern Canada and
the United States begin their annual migration to California and central Mexico,
roosting along the way on golf courses and beaches in Florida and California. In
March, the butterflies embark on a return trip north. Because no single butterfly
completes the entire migratory cycle, scientists believe that genetic information
about directions and timing are passed down through the generations.
Disponível em:http://www.rd.com/culture/butterfy-facts/. Acesso em: dez. 2015.