Western monarch butterfly numbers critically low for second straight year

Monarch butterfly populations are at a critical low, according to the annual Western Monarch Count in California. In the fall and winter, western monarchs (Danaus plexippus plexippus) stop to roost along the Pacific coast in California. Here, under the direction of the Xerces Society, nearly 200 trained volunteers find and count monarchs for the annual Western Thanksgiving and New Year’s counts, now in its 23rd year. And for the second year in a row, the counts have generated troubling numbers. Fewer than 30,000 individuals were found — the number, researchers say, may be the tipping point for the population.