You can help the Monarch Butterfly survive.

[BrianEn]

I was just listening to a back episode of Coast to Coast. Linda Molten Howe recommended planting milkweed in spots where you can to help the Monarchs in their migration. Survival of butterflies is made difficult by the use of round up pestiside. Planting milkweed in spots untouched by this pesticide will help.
You'll also get a good natural show when or if the butterflies stop by.

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http://www.youtube.com/watch?v=xC-axB5R1_Y

[BrianEn]

http://i389.photobucket.com/albums/oo332/BrianEn66/Monarch20Butterfly_zpsf33c2fad.jpg

[xbusymom]

does the migration path change as the magnetic north moves?

[BrianEn]

I don't know.