Do Yellow-legged gulls (Larus cachinnans) use refuse tips whenever they need to?

Resumen

The use of refuse tips by Yellow-legged gulls was investigated at two tips in NE Spain during three complete days. The pattern of work at refuse tips greatly influenced the time of arrival and departure of individuals, the hour and duration of the feeding activity, and the daily maximum schedule. Yellow-legged gulls seemed not to feed at refuse tips whenever they needed to but only when they were able to do so.