It's so easy to get blasé abut birds. There was a time not many years ago when both Yellow-legged and Mediterranean Gulls were very scarce indeed in Guernsey. Those days are long past, with flocks of Mediterranean Gulls in Bellegreve Bay reaching almost 100 birds now in the early autumn. Yellow-legged Gulls are still only seen in much smaller numbers, but at least they are regular at certain times of the year.
Today I recorded two immature Yellow-legged Gulls at Chouet landfill Beach. Both were immature birds - one 2nd and one 3rd calendar year bird. The former was a bird colour ringed (Black 4CT7) at Chouet Landfill, Guernsey on 15 May 2015 (but it had not been reported since). There were also four Mediterranean Gulls in Bellegreve Bay - the vanguard of the late summer/early autumn arrivals!