The Panama Canal is being expanded to accommodate larger ships carrying bigger loads. The construction has exposed a trove of fossils, revealing a wide array of creatures that lived at the southern end of North America 20 million years ago. For more global science stories, visit: http://www.world-science.org/ NOVA is produced by WGBH in Boston. National corporate funding for NOVA is provided by The Boeing Company. Major funding for NOVA is provided by David H. Koch, the Corporation for Public Broadcasting, and PBS viewers.