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Terns - Arctic or Common?

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Old Monday 11th August 2014, 14:06   #1
PeterHD
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Terns - Arctic or Common?

Hi All - I am struggling with some tern ID. These pictures were all taken in early August a few years ago in Northern Denmark (location: Skagen Beach).

I cannot find out if they are Arctic Terns (Sterna paradisaea) or Common Terns (Sterna hirundo)?

There are four birds in question:
Collage 1: The same bird seen from two slightly different angles
Collage 2: A Sandwich Tern (Sterna sandvicensis) has caought a fish and a smaller tern is looking at it. The smaller tern - what species is that?
Collage 3: The same Sandwich Tern is now being chased by another small tern. What species is it?
Collage 4: This small tern was sitting on the beach and I got these two pictures.

Any comments will be appreciated.

Best, Peter
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Old Monday 11th August 2014, 15:38   #2
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The white secondries point to Arctic Tern as well as the shorter bill & short legs on the perched bird.
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Old Monday 11th August 2014, 15:44   #3
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#1 - juvenile Arctic / Havterne
#2 - adult & juvenile Sandwich / Splitterne
#3 - juvenile Arctic
#4 - juvenile Arctic

Juvenile Common / Fjordterne differs in being browner toned above (greyer in Arctic), with a dark secondary bar (pale secondaries in Arctic).
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Old Monday 11th August 2014, 19:22   #4
PeterHD
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Hi Parker and Nutcracker - thanks a lot! A great help :-)
Best, Peter
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Old Monday 11th August 2014, 19:23   #5
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PS. And Danish names as well Nutcracker - great service :-)
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