Not sure what kind of birds

[MitchP]

Google doesn't help. Oh well.

 

[Jeff15]

Some sort of Gull maybe...?

 

[terri]

Someone around here should know - we have tons of birders here. They have a very distinctive look, with those black heads.

Nice capture of your mystery birds in flight!

 

[Space Face]

They are very similar to our UK Black-Headed Gulls. I don't know what the US variation is but they are Gulls of some description.

 

[jeffashman]

Nice shot! Seek says that they are Bonaparte's Gull. Matches with the black head and white "collar."

 

[Joel Bolden]

Yeah, definitely Bonaparte's Gulls. I see them as they migrate through this part of Pennsylvania. Lovely shot.

 

[slat]

Nice shot.