Snails on a tiny rocky islet evolved before scientists’ eyes. The marine snails were reintroduced after a toxic algal bloom wiped them out from the skerry. While the researchers intentionally brought in a distinct population of the same snail species, these evolved to strikingly resemble the population lost over 30 years prior. The study, led by researchers from the Institute of Science and Technology Austria (ISTA) and the Norwegian Nord University, is published in Science Advances.