Radiograph of <I>Darwinius</I> (IMAGE) University of Toronto Caption Darwinius is one of the best preserved early fossil primates known to exist. Credit Jens L. Franzen et al: <a href="http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0005723;jsessionid=E8154D7406947B36A39470C790A4F08C" target="_blank">http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0005723;jsessionid=E8154D7406947B36A39470C790A4F08C</a> Usage Restrictions Open source but please cite the original authors and research paper: Jens L. Franzen et al: <a href="http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0005723;jsessionid=E8154D7406947B36A39470C790A4F08C" target="_blank">http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0005723;jsessionid=E8154D7406947B36A39470C790A4F08C</a> License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.