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Scientists Express Concern Over Dwindling Number Of Migrating Monarch Butterflies04:35
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Every year, monarch butterflies journey from Canada and New England all the way to Mexico.

It's an ecological wonder. But scientists are worried as they've recently noticed a dip in the number of butterflies making the trip.

Some say climate change and severe weather could be threatening the migration. Also, what's been seen as the primary driver is a lack of milkweed plants — vital food for the butterflies.

But as WNPR reporter Patrick Skahill tells Morning Edition, a controversial new paper is questioning that theory.

This segment aired on June 1, 2016.

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