Sylvain Cordier / Monarch butterfly (Danaus plexippus) wintering in Oyamel pine forests (Abies religiosa) Monarch Butterfly Biosphere Reserve / Reserva de Biosfera de la Mariposa Monarca UNESCO World Heritage Site, An...

Sylvain Cordier / Monarch butterfly (Danaus plexippus), wintering from November to March in Oyamel pine forests (Abies religiosa) Monarch Butterfly Biosphere Reserve, Mexico.

Floris van Breugel / Monarch butterflies (Danaus plexippus) over winter on Eucalyptus and Monterey Cypress trees near Pismo Beach, San Luis, California, USA December.. When temperatures warm up enough, they will embark on...

Claudio Contreras / Monarch butterfly (Danaus plexippus) hibernating, Mariposa Monarca Special Biosphere Reserve, central Mexico, January.

Claudio Contreras / Monarch butterfly (Danaus plexippus) hibernating, Mariposa Monarca Special Biosphere Reserve, central Mexico, January.

Floris van Breugel / Monarch Butterflies (Danaus plexippus) roosting in winter in dense groups, Southern California, USA

Stephen Dalton / Monarch butterfly (Danaus plexippus) female in flight. Did you know? Monarch buttterflies migrate up to 2500 miles from Mexico to Canada.

Inaki Relanzon / Clouds of Monarch butterflies {Danaus plexippus} flying and resting on trees while on migration, Miochacan, Mexico, January 1997

Jack Dykinga / Monarch Butterflies (Danaus plexippus) covering the trunk of a coniferous tree, Sierra Chincua Monarch Butterfly Biosphere Reserve, Michoacan, Mexico, Central America

Rolf Nussbaumer / Monarch butterfly just emerged from chrysalis {Danaus plexippus} Texas, USA.

Heather Angel / Monarch butterflies (Danaus plexippus), three nectaring on Poinsettia (Euphorbia pulcherrima), resting on red bracts. In butterfly house, Xishuangbanna, Yunnan Province, China.

Doc White / Monarch butterfly, (Danaus plexippus), migrating group resting in tree Pismo Beach, California, USA. January.