The number of monarch butterflies in Mexico has grown for the second consecutive year, suggesting that the population has stabilized after years of decline. This comes as a sign of hope for the future of these iconic American insects. According to WWF Mexico, the decline of eastern monarchs, the world’s largest population, has stopped, even as they face worsening threats across their range. The latest increase was attributed to weather conditions, providing adult monarchs with lots of flowers to feed on. Despite this, the U.S. Fish and Wildlife Service has been sued by two environmental groups to set a final rule on the endangered species. The decline in U.K. monarch populations is largely due to genetically modified seeds planted in the Midwest, which allowed farmers to spray fields and kill weeds growing in them.