Researchers found pesticide-contaminated plants in nurseries in 15 states
The California overwintering population has been reduced to less than 0.5% of its historical size, and has declined by 86% compared to 2017.
A study in Biological Conservation led by a WSU scientist documents the steep decline of monarch butterflies in the West. They could be functionally extinct within a few decades.
Rare monarch caterpillar-butterfly (Danaus plexippus) seen in five years.
8-10-14 Thousands of caterpillars - Lake Clark National Park, Alaska, USA
Observations From Members 