And then there was one....

As expected, as wintering birds disperse, the number of Black-headed Gulls present at our main winter catching site has dramatically decreased. 

Keith Stevens got in touch to say that numbers were well down and that 2AAF was the only colour-ringed bird still there.

This bird was the only juvenile ringed there, which may suggest why it's the only one still around.  It is most likely that all of the adults have dispersed to their respective breeding colonies.