The Monarch Butterfly (Danaus plexippus)

This species is currently listed as at-risk.
It is the only one North American butterfly who migrate, each year,
in large number.
The Monarch travels up to 4000 kilometers to reach overwintering
sites in Mexico.
To promote their recovery, consider creating a butterfly habitat in
your backyard.

For more info click, on this link :

http://blog.wwf.ca/blog/2012/08/15/protecting-the-monarch-butterflies-conservation-in-your-own-backyard/