Why people raise monarch butterflies in captivity — and why scientists advise against it

Populations of migratory monarch butterflies have declined by an estimated 90% since the mid-1990s due to the loss of their natural habitat along their migration route. As monarchs fly through St. Louis on their way to Mexico, we hear from a St. Clair, Missouri, resident who is attempting to boost monarch populations by rearing them in enclosures in her backyard. We also talk with an entomologist who is concerned that captive breeding programs may produce weaker, disease-prone butterflies that aren’t equipped to complete the journey. And, a Missouri Botanical Garden botanist shares the best ways to support monarch butterflies, including when to plant milkweed, which is the only host plant on which monarchs lay their eggs.