The Eocene Period (cc. 43 to 66 million years ago) was a time of intense global warming, providing an important case study of how ecosystems react to changing climates. By examining fossils from the Ellesmere Island in Canada, a team of researchers led by the University of Kansas has found evidence of a warm, swamp-like environment around 52 million years ago, despite half the year experiencing Arctic harsh winter darkness. Based on fossil fragments of jaws and teeth, the experts identified two new species of primates -...