Slender-billed Gull ~ Ebro Delta, SpainSlender-billed Gull ~ Ebro Delta, SpainSlender-billed Gull ~ Ebro Delta, SpainSlender-billed Gull ~ Ebro Delta, SpainSlender-billed Gull ~ Ebro Delta, SpainSlender-billed Gull ~ Ebro Delta, SpainSlender-billed Gull ~ Ebro Delta, SpainSlender-billed Gull ~ Ebro Delta, SpainSlender-billed Gull ~ Ebro Delta, Spain