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The red spot of the yellow-legged gull
When they reach sexual maturity, from four years old, the yellow-legged gulls (Larus michahellis) have red spots appearing on their lower mandibles. As soon as they are hatched, the newly-born chicks instinctively peck those of their parents to induce the regurgitation of food in their throats. Yellow-legged gulls are numerous around the banks of the artificial lake of Serre-Ponçon, created in 1959 in the Hautes-Alpes department.
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