John Rafferty of Encyclopaedia Britannica discusses two species of monarch butterflies in North America that have declined as a result of habitat loss and the effects of pollution. This is the fourth part of the Postcards from the 6th Mass Extinction audio series. 

Postcards from the Sixth Mass Extinction, 4th program. John Rafferty, speaker & writer; J.E. Luebering sr. editor; Kurt Heintz producer

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