Search dynamics at the edge of extinction: Anomalous diffusion as a critical survival stateC. L. Faustino, L. R. da Silva, M. G. E. da Luz, E. P. Raposo and G. M. ViswanathanEPL, 77 3 (2007) 30002DOI: https://doi.org/10.1209/0295-5075/77/30002