Updated: 17/10/2011 11:33 | By Charlotte Amelines, contributor, MSN Travel
30 natural marvels you’ve probably never heard of

Monarch butterflies, Mexico



Monarch butterflies swarming in the Oyamel fir forests of Mexico (Image © Kirsten Luce/PA)
Next
Previous
Previous17 of 30Next
Share this Gallery

In one of the most sensational migrations on Earth, around 250 million monarch butterflies travel south from America every November to the Oyamel fir forests of Mexico, where they fill the sky with a storm of orange and black. So dense are their numbers that tree branches sag under their weight. Three main bio-reserves exist to support the butterflies: El Rosario, El Capulin and Piedra Herrada.

0Comments
10 reasons to make MSN UK your homepage (© Microsoft)
Image Search for Monarch butterflies, Mexico on Bing
Image
Previous 1 of 1 Next
loading
See more results results by

More on msn Travel