The number of monarch butterflies spending the winter in the western United States has dropped to its second-lowest mark in ...

For 28 years, the Xerces Society for Invertebrate Conservation has counted monarch overwinter populations along the ...

The count of 9,119 butterflies this winter is a sharp decline from 200,000 reported in the past three years, but slightly up from 2,000 monarch reported in 2020.

Just over 9,000 monarchs were counted in California last winter, the second lowest ever since the annual count began in 1997 ...