Giant tortoises (Chelonoidis spp.) have trundled across the Galápagos Islands for perhaps 3 million years. Over that time, they’ve evolved to survive with little food or water in the islands’ harsh desert environment. But this ability also made the tortoises an excellent source of food for mariners, who often picked up a couple when they … Continue reading Stamping out invasive species has successful track record on islands, study finds