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Which tern, Nouakchott, Mauritania

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Old Saturday 25th August 2018, 14:03   #1
BirdingRob
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Which tern, Nouakchott, Mauritania

Seen today.

Which species (singular or plural) are these two terns please?

Rob
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Old Saturday 25th August 2018, 14:34   #2
Valéry Schollaert
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I'm pretty confident the juvenile is Black Tern. The other one might be the same species, but I feel much less confident. It looks larger, but i might be optical effect. I'll be happy to read expert comments, those "marsh" terns are terrible especially during their complete moult as now.
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Old Saturday 25th August 2018, 14:38   #3
SteveClifton
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Quote:
Originally Posted by Valéry Schollaert View Post
I'm pretty confident the juvenile is Black Tern. The other one might be the same species, but I feel much less confident. It looks larger, but i might be optical effect. I'll be happy to read expert comments, those "marsh" terns are terrible especially during their complete moult as now.
Based on the final image they both appear the same size, hence both are Black terns. Bill shape/length fits Black Tern rather than any other sp.
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Old Saturday 25th August 2018, 21:14   #4
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Thank you both, Many tens of black terns on their way south today in Nouakchott.
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