Munilla, I. & Velando, A. Oiling of live gulls as a tool to monitor acute oil spill effects on seabirds. Ibis 152, 405–409 (2010).

Here we present a novel non-intrusive approach that can be useful to assess oil effects on seabirds based on the monitoring of oiling rates in live free-ranging gulls. To assess the feasibility of this method, we established a monitoring scheme to record oiling rates in live gulls in a coastal area affected by the Prestige oil spill disaster in Galicia (northwest Spain).