a lot of Gulls have it, a coloured spot on the beack. The Lesser Black-backed Gull - Kleine Mantelmeeuw / Larus graellsii has a red one; It is a target spot for the youngs. They tap on it to receive food from the parents; Then the elder trow up some food for them.
This daily newspaper readers shot is my choice for # 10 It was taken while strolling through the seaside town of Yamba on the Clarence Coast, Northern N.S.W