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GrrlScientist is an evolutionary biologist and ornithologist who loves to write about "E3": evolution, ethology and ecology and the subtle relationships between these fields, especially in birds.

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Mystery Bird: Caspian Tern, Sterna caspia

Topic Categories: BirdingMystery BirdsPhotography
Posted on: January 27, 2009 9:59 AM, by "GrrlScientist"

tags: , , , ,

[Mystery birds] Caspian Tern, Sterna caspia, photographed the Quintana Beach and Jetty area, Texas. [I will identify this bird for you tomorrow]

Image: Joseph Kennedy, 18 November 2008 [larger view].

Nikon D200 1/1250s f/8.0 at 1000.0mm iso400.

Please name at least one field mark that supports your identification.

Review all mystery birds to date.

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Comments

1

Well, it is obviously a tern.

I'm going to go for Common Tern (Sterna hirundo), citing the black-tipped, orange-red bill, faint black tint to wingtips, gray body with lighter underbelly and the distinctive mask. This bird doesn't have the silver-white primaries or the right mask shape of the Forster's Tern, and lacks the white forehead patch of a Least Tern (and feels too large, although there's no scale here).

Posted by: Erpentes | January 27, 2009 10:54 AM

2

Caspian?

Posted by: Sven DiMilo | January 27, 2009 10:57 AM

3

I believe that's a Caspian Tern, based on the "dark red bill with dusky tip" and relatively large amount of "dark under primaries" (Sibley).

Posted by: John Callender | January 27, 2009 10:58 AM

4

Can't see any bread, so it isn't a sandwich tern.

Posted by: Bob O'H | January 27, 2009 12:46 PM

5

What a beautiful photo of a Caspian Tern! The very heavy red-orange bill and black cap are a give away. Grrlscientist, could you please contact me directly about publishing one of your articles in a newsletter for Nisqually National Wildlife Refuge? Thanks.

Posted by: Sheila | January 27, 2009 2:48 PM

6

I'm going with the Caspian, also.

Posted by: Michelle | January 27, 2009 4:33 PM

7

Beautiful photo of a Caspian Tern- Heavy bill and dark underside of primaries are giveaways.

Posted by: Mac | January 27, 2009 6:22 PM

8

Based on the dark red with dark tip bill (and thicker, heavier bill) as well as the black cap and dark under the primaries I'd say Caspian Tern.

Posted by: Margie | January 27, 2009 7:57 PM

9

I'm going with Caspian Tern--big, red tern bill.

Posted by: Paulette | January 27, 2009 10:35 PM

10

One more vote for Caspian Tern. Dark under the primaries and dark red, dark-tipped bill are good clues to identification. So is the flight posture of the tern -- flying with the bill oriented downward as if it were to heavy for the head to hold in a horizontal position.

Posted by: Sharon Chester | January 28, 2009 2:33 PM

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