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Why are monarch butterflies disappearing?

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ST. LOUIS – Wildlife experts call it the “monarch massacre” – nearly a billion butterflies have vanished.

The U.S. Fish and Wildlife Service said about 970 million butterflies have died since 1990. Now, a multi-million dollar effort is underway bring the monarch butterfly back from the brink – and you can help.

Chris Hartley, a spokesman for the Butterfly House, visits Fox 2 News in the Morning to explain why monarch butterflies have disappeared, the area’s importance in the migration of the monarch, and which other butterflies are in danger.