Monarch butterflies overwintering along the California coast have declined by 96% in a year, with habitat loss, pesticides and extreme heat contributing to their second-lowest population in nearly ...

The number of monarch butterflies spending the winter in the western United States dropped dramatically this year even as ...

The number of monarch butterflies spending winter in the western U.S. dropped dramatically this year, despite moves to extend ...

NEW YORK, Jan. 31 (Xinhua) -- The Western population of the monarch butterfly has declined to a near-record low with fewer than 10,000 found living in U.S. California this winter, a foreboding sign ...