Over half of the world's population now lives in an urban area, according to a recent report by the United Nations. And that number is expected to grow to two-thirds by the middle of this century. Rapid urbanization's effects on local ecosystems and their biodiversity are not yet fully understood. But the Global Urban Evolution Project (GLUE), an ongoing international collaboration involving hundreds of researchers including two from the University of Concordia, is working to build a more complete image of how flora and fauna are adapting to their changing environments.