1. La Brea Tar Pits and MuseumNatural History Museum of Los Angeles County 5801 Wilshire Boulevard Los Angeles California 90036 USA
2. Biology DepartmentBoston University 5 Cummington Mall Boston Massachusetts 02215 USA
3. Department of Organismic and Evolutionary Biology and Harvard University HerbariaHarvard University Cambridge Massachusetts 02138 USA
4. Department of Biology Teaching and LearningUniversity of Minnesota Minneapolis Minnesota 55455 USA
5. Department of BiologyUniversity of Washington 24 Kincaid Hall Seattle Washington 98195 USA