1. Museum of Comparative Zoology, Harvard University, Cambridge, MA 02138, USA
2. Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA
3. Department of Applied Physics, Aalto University School of Science, Espoo 02150, Finland
4. Wyss Institute for Biologically Inspired Technology, Harvard University, Cambridge, MA 02138, USA
5. Department of Physics of Complex Systems and Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot 76100, Israel
6. Center for Nano Sciences, Harvard University, Cambridge, MA 02138, USA
7. Department of Materials and Interfaces, Weizmann Institute of Science, Rehovot 76100, Israel
8. Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
9. Department of Mechanical Engineering, Virginia Tech, Blacksburg, VA 24060, USA