i spent from about 3-4 today searching for the Black-headed Gull at Hunt Valley Mall in Maryland. No luck today - just lots of Ring-bills. The Black-headed was seen earlier in the day though. It is being seen daily. We'll really search our heads off for it tomorrow.
I'm at the Mt. Washington Hotel and Resort in the out-skirts of Baltimore and am right in position for the full chase tomorrow. I will post tomorrow evening. Really hoping to get number 430 with this sucker.