Following a migration that started in Mexico, monarch butterflies have reached Michigan. Here's where they've been spotted.

This week on 60 Minutes, correspondent Anderson Cooper reports on the migration of the monarch butterflies ... "this takes the cake." Photos courtesy of Court Whelan. The video above was produced ...

Monarch butterflies left Mexico weeks ago on their ... Adult monarchs feed on wild cherry, lilac, Labrador tea, blazing star, red clover, dogbane, goldenrods, ironweeds, joe-pye-weed, marigolds ...

After wintering over in Mexico, monarch butterflies are migrating to their northern breeding grounds, which includes Michigan. Journey North uses volunteer-submitted data to track the migration.

Monarch butterflies are returning to Michigan for ... In addition, monarchs feed on wild cherry, lilac, Labrador tea, blazing star, red clover, dogbane, goldenrods, ironweeds, joe-pye weed ...