1. Black-headed Gulls Larus ridibundus, first-basics, Indian River Inlet, Delaware, USA, December 29, 2000.  Two first winter birds were present with a large flock of Bonaparte's Gulls L. philadelphia.  Note the large, orange-based bills the dusky undersides to the primaries (visible on the closer bird).  On the more distant individual, the contrastingly dark inner primaries and corresponding inner greater primary coverts on the upper side of the wing are clearly visible.  BHGU_01

2. Black-headed Gull L. ridibundus, first-basic, Indian River Inlet, Delaware, USA, December 29, 2000.  One of the above individuals, this time with two Bonaparte's Gulls.  Although it is closer to the camera, note the more bulky look of the Black-headed Gull, with it's more robust, orange-based bill.  BHGU_02

3. Black-headed Gull L. ridibundus, first-basic (left), with Bonaparte's Gull L. philadelphia, adult (right), Indian River Inlet, Delaware, USA, December 29, 2000.  Another interesting comparison of size and shape between these two species.  BHGU_03

4. Black-headed Gull L. ridibundus, first-basic, Indian River Inlet, Delaware, USA, December 29, 2000.  Again, one of the same two individuals.  This one was distinctive in that it was missing a central tail feather.  BHGU_04

5. Black-headed Gull L. ridibundus, first-basic, Indian River Inlet, Delaware, USA, December 29, 2000.  The distinctive dusky undersides to the primaries are visible on the left wing.  The darker inner primaries and greater primary coverts are just visible on the upper side of the right wing behind.  BHGU_05

6. Black-headed Gull L. ridibundus, first-basic, Indian River Inlet, Delaware, USA, December 29, 2000.  BHGU_06

© Stephen J. Davies

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