Black-headed Gulls On The Reservoir
Birders patient enough to look through all of Central Park’s gulls have been rewarded with some rarities this winter. In January, we had a Short-billed Gull, Glaucous Gull, and a few Lesser Black-backed Gulls, Iceland Gulls and Black-headed Gulls. These gulls were in addition to our regular Ring-billed Gull, American Herring Gull and Greater Black-backed Gull species which we see daily during the winter.
Over the last few weeks, we’ve been seeing the return of some Black-headed Gulls. What’s unclear is how many different individuals we’re seeing. We’re seeing at least one in adult plumage and at least two different individuals in 1st cycle plumage.
Adult
This could easily be just the same gull transitioning to alternate plumage.
Adult – January 27


Adult, March 16






Adult – March 20








Sub-Adults
There are at least two different individuals. The gull seen on March 15 has a darker head that the ones seen late in March. Also the bird on March 18 has a tail that ends in a black band, while the others had a black subterminal band, with a thin bad of white at the tip of the tail. What has been an interesting lesson for me is how different the head marking appears based on the posture of the bird and the light.
Sub-Adults – January 18






Sub-Adults – January 24


Sub-Adults – January 27






Sub-Adults – March 15








Sub-Adults – March 16


Sub-Adults – March 18








Sub-Adults – March 21








Sub-Adults – March 22



