1. School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA
2. School of Plant Science and Food Security, Tel Aviv University, Tel Aviv, Israel
3. Department of Collective Behaviour, Max Planck Institute for Ornithology, University of Konstanz, Konstanz, Germany
4. Department of Biology, University of Konstanz, Konstanz, Germany
5. Department of Physics, Harvard University, Cambridge, MA, USA
6. Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA, USA
7. Kavli Institute for NanoBio Science and Technology, Harvard University, Cambridge, MA, USA