In Forest Debris, the Odor of Dead Monarchs: “Walking up the steep path through what remains of the montane forest at the Rosario sanctuary, it is hard at first to notice the monarch butterflies everywhere. Then the wind shifts and the smell of rotting insect corpses hits the steady stream of tourists going by. What had seemed at first to be fallen leaves and forest debris reveals itself as a lumpy carpet of millions of butterflies that perished in the largest known die-off ever of these insects.” NY Times