On #CallToEarth Day, we’re spotlighting the red imported fire ant — one of the world’s most invasive species — newly discovered for the first time in Europe. From gardens to orchards to farmland, these ants threaten the green spaces people depend on. Scientists are in a race to stop the spread before it’s too late. 📸: 1 Janosch Waldkircher/CNN, 2-3 CNN, 4 Patrick Lynch/Alamy, 5-7 CNN, 8 Janosch Waldkircher, 9 CNN