[Length 18 in. Wingspan 44 in.]

This adult Black Skimmer was photographed at the Birding Center, Port Aransas, Texas, USA. Photo taken with a AF-S VR Nikkor 300mm f/2.8G IF-ED lens + Nikkor TC14E II 1.4x Teleconverter (EFL=630mm) on a Nikon D300 camera. (Date: August 23, 2009)

[Length 18 in. Wingspan 44 in.]

This Black Skimmer was photographed at the tidal flats behind the SPI Convention Center, South Padre Island, Texas. Photo taken with a AF-S VR Nikkor 200-500mm f/5.6 IF-ED lens on a Nikon D7100 camera. (Date: May 07, 2018)

[Length 18 in. Wingspan 44 in.]

This Black Skimmer in flight was photographed at the South Padre Island Convention Center boardwalk, South Padre Island, Texas. Photo taken with a AF-S VR Zoom-Nikkor 80-400mm f/4.5-5.6G IF-ED lens on a Nikon D7100 camera. (Date: December 28, 2018)

[Length 18 in. Wingspan 44 in.]

This Black Skimmer in flight was photographed near a traditional nesting site along the central coast of New Jersey, USA. Photo taken with a Nikkor 300mm ED f4.5 lens on Kodachrome 64 film. (Date: September 1984)

[Length 23 in. Wingspan 55 in.]

This Great Skua was photographed at Quendale, Mainland, Shetland, Scotland, Great Britain. Photo taken with a Nikkor 180mm EDAF-D f2.8 lens (EFL=270mm) on a Nikon D100 camera. (Date: June 2, 2004)

[Length 23 in. Wingspan 55 in.]

This Great Skua was photographed at Hermaness NNR, Haroldswick, Unst, Shetland, Scotland, Great Britain. Photo taken with a Nikkor 300mm EDAF-S f4 lens (EFL=450mm) on a Nikon D100 camera. (Date: June 4, 2004)

[Length 12 in. Wingspan 29 in.]

This Aleutian Tern was photographed at Attu Island, AK, USA. Photo taken with a Nikkor ED 300mm f4.5 lens on Ektachrome 200 film. (Date: May 1984)

[Length 12 in. Wingspan 31 in.]

This Arctic Tern was photographed at Loch of Funzie RSPB Reserve, Funzie, Fetlar, Shetland, Scotland, Great Britain. Photo taken with a Nikkor 300mm EDAF-S f4 lens (EFL=450mm) on a Nikon D100 camera. (Date: June 7, 2004)