Search dynamics at the edge of extinction: Anomalous diffusion as a critical survival state C. L. Faustino, L. R. da Silva, M. G. E. da Luz, E. P. Raposo and G. M. Viswanathan EPL, 77 3 (2007) 30002 Published online: 23 January 2007 DOI: 10.1209/0295-5075/77/30002