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Kaja Kallas; Susan Glasser; Stephanie Land

The Monarch Butterfly with its orange and black wings, and look-alike mimic the Viceroy Butterfly are well entrenched in our educational system from grade school through graduate school. But details of the Monarch’s life and its mimic relationship with the Viceroy Butterfly are not so well known. Monarchs lay their eggs on milkweed and caterpillars that emerge feed on milkweed leaves. These leaves often provide toxins that protect the butterfly – often, not always. That protective toxin – gained during the caterpillar stage -- can disappear from the butterfly over time because the adult butterfly feeds on the nectar of many different flowers. Milkweeds are popular plants as ornamentals that attract Monarchs. One most prominently for sale is Tropical Milkweed, an exotic species with beautiful red and orange flowers. Tropical Milkweed has become an invasive and lives through Florida winters, building up populations of a parasite of Monarchs that can impair the butterflies. Unlike Tropical Milkweed, most of our native milkweeds die in winter and the monarch parasites die with them.

Sacha Pfeiffer is a correspondent for NPR's Investigations team and an occasional guest host for some of NPR's national shows.

The Monarch Butterfly with its orange and black wings, and look-alike mimic the Viceroy Butterfly are well entrenched in our educational system from grade school through graduate school. But details of the Monarch’s life and its mimic relationship with the Viceroy Butterfly are not so well known. Monarchs lay their eggs on milkweed and caterpillars that emerge feed on milkweed leaves. These leaves often provide toxins that protect the butterfly – often, not always. That protective toxin – gained during the caterpillar stage -- can disappear from the butterfly over time because the adult butterfly feeds on the nectar of many different flowers. Milkweeds are popular plants as ornamentals that attract Monarchs. One most prominently for sale is Tropical Milkweed, an exotic species with beautiful red and orange flowers. Tropical Milkweed has become an invasive and lives through Florida winters, building up populations of a parasite of Monarchs that can impair the butterflies. Unlike Tropical Milkweed, most of our native milkweeds die in winter and the monarch parasites die with them.