The monarch population is already small, she said, and triple-digit heat in the western states last year may have slowed breeding. Monarchs suffer when the mercury gets up to 100 degrees ...

Monarchs across the continent face mounting threats ... wildlife service to reduce the risks of damage. "The iconic monarch butterfly is cherished across North America, captivating children ...

The monarch population is already small, she said, and triple-digit heat in the western states last year may have slowed breeding. Monarchs suffer when the mercury gets up to 37.7 degrees Celsius ...

Monarchs across the continent face ... Monarch Butterfly Festival and Run in Peterborough aims to raise awareness, funds for endangered species Monarchs suffer when the mercury gets up to 100 ...

The monarch population is already small, she said, and triple-digit heat in the western states last year may have slowed breeding. Monarchs suffer when the mercury gets up to 100 degrees ...

Dramatic Drop in Monarch Butterfly Count Nears Record 30-Year Low ... Heat may have doomed western monarchs Monarchs across the continent face mounting threats, chief among them vanishing milkweed ...

A butterfly sits on a leaf at Monarch Grove Sanctuary in Pacific Grove ... Monarchs across the continent face mounting threats, chief among them vanishing milkweed, the host plant for the insect ...

Fewer-than-usual monarch ... butterfly habitat. She also encouraged people to volunteer with the Xerces Society to collect data about monarchs and spread the word about challenges the insects face.