Kaplan-Meier curves with 95% confidence intervals (dashed lines) for 12 oiled, rehabilitated, and tagged (gray) and eight control (black) California Brown Pelicans (Pelecanus occidentalis californicus) followed for 1 yr after release using telemetry. Tick marks indicate time of disappearance (censoring) of individual birds. Log-rank test; chi-square=0.9, P=0.3.