People in northern climates are familiar with flocks of birds flying south in the winter, but why do they do it, and why ...

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

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

This winter, volunteers from the Xerces Society, a nonprofit environmental group, tallied just 9,119 western monarchs — a ...

The findings challenge previous assumptions about butterfly migration and highlight the role of phenotypic plasticity.

Fewer-than-usual monarch butterflies migrated through ... Pismo Beach’s butterfly count matches migration data from the rest of the West Coast. Only 9,119 butterflies were counted at West ...

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

The Western population of the monarch butterfly has declined to a near-record low with fewer than 10,000 found living in California this winter, a foreboding sign for the future of the beloved ...

The annual Western Monarch Count observed a peak population of 9,119 Monarch butterflies in California this winter, marking a sharp decline in the last few years. The count, administered by the ...

I found a nascent but powerful reordering of the world map of opportunity and a political class utterly unprepared to manage and adapt to this new order. Migration is, in many ways, a sign of our ...

Migration will be a key focus throughout Rubio’s trip, set against the backdrop of the dramatic confrontation between Trump and Colombian President Gustavo Petro last Sunday. Discussion about ...