Researchers urge Canada, U.S., and Mexico to invest $150M to save the monarch butterfly from habitat loss.

Researchers are urging Canada, the U.S., and Mexico to save the monarch butterfly, whose population has dropped by 80% over two decades due to habitat loss. The study in Current Biology suggests investing $150 million over five years to restore milkweed plants, the only food source for monarch caterpillars. A coordinated conservation strategy is proposed to protect the butterflies and their habitats across the three countries.