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Monarch Butterflies The Monarch butterfly has become a symbol of the fragility of the natural world in the face of developments such as genetically engineered crops. NPR's John Nielsen spends a day with Lincoln Brower - the world's leading authority on Monarchs - who says that BT corn is not the only threat these butterflies face.

All Things Considered

Monarch Butterflies

Heard on All Things Considered

Monarch Butterflies

Audio will be available later today.

The Monarch butterfly has become a symbol of the fragility of the natural world in the face of developments such as genetically engineered crops. NPR's John Nielsen spends a day with Lincoln Brower - the world's leading authority on Monarchs - who says that BT corn is not the only threat these butterflies face.