Entangled active matter: From cells to ants D.L. Hu, S. Phonekeo, E. Altshuler and F. Brochard-Wyart Eur. Phys. J. Special Topics, 225 4 (2016) 629-649 Published online: 15 July 2016 DOI: 10.1140/epjst/e2015-50264-4