Monarchs across the continent face mounting threats, chief among them vanishing milkweed, the host plant for the insect's caterpillars.
The number of monarch butterflies spending the winter in the western United States has dropped to its second-lowest mark in nearly three decades as pesticides, diminishing habitat and climate change take their toll on the beloved pollinator.Here's what to know:Monarch butterflies, known for their distinctive orange-and-black wings, are found across North America.
Monarchs suffer when the mercury gets up to 100 degrees Fahrenheit and any temperatures above 108 degrees Fahrenheit are lethal to the insects, Pelton said. The western states saw a heat wave in July that drove temperatures in some areas well past 100 degrees. Palm Springs, for example, hit a record 124 degrees Fahrenheit on July 5. Another heat wave cooked northern California in early October, with multiple cities breaking heat records.
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