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ZEISS. Discover the fascinating world of birds, and win a birding trip to Columbia

Diver sp, Durham, UK 12/11/21 (1 Viewer)

Alexander Stöhr

Well-known member
Hello again,
I agree with Andrew, that this has to be a "pitfall-picture" of Red-throated Diver.
I hope the term "pitfall-picture" doesnt come out as an offense, so I will explain it:
  • its hard to judge imo, if the straight forehead, merging into the bill, resulting in a smooth triangular, yet still rounded head, is not the result of camera angle. If its real, its a good shape for a Red-throated Diver, if not than its a pitfall picture of a BTD
  • I hope to see the "cobra-shaped" neck shape of a rear-viewed Black-throated Diver. But I see a uniform, still broad neck, good for both of them (is it slightly better for a RTD, I am not sure, I hope for others to jump in)
  • yes, the pale throat patch seems good for a RTD, but camera angle makes this hard to judge. Might well be easier with a side or a slightly front view
  • I have lost faith in colouration/pattern of the flanks as a feature in basic-plumaged birds. Yes, if the bird has dark(ish) flanks with a contrasting white patch on the rear tigh area (yes, it must be strightly in the right area) than I go for a BTD, but only then. So I skip this feature here.
  • Look, how long the head and the bill is. Even allowing for a foreshortening effect, this gives this bird a RTD jizz to me. But yes, it can be a pitfall picture of a BTD.
I must admit, this post came out more confident, than it is intendet to be. But yes, I am in the 1 cy Red-throated Diver-camp here, too.
 
Hello again,
I agree with Andrew, that this has to be a "pitfall-picture" of Red-throated Diver.
I hope the term "pitfall-picture" doesnt come out as an offense, so I will explain it:
  • its hard to judge imo, if the straight forehead, merging into the bill, resulting in a smooth triangular, yet still rounded head, is not the result of camera angle. If its real, its a good shape for a Red-throated Diver, if not than its a pitfall picture of a BTD
  • I hope to see the "cobra-shaped" neck shape of a rear-viewed Black-throated Diver. But I see a uniform, still broad neck, good for both of them (is it slightly better for a RTD, I am not sure, I hope for others to jump in)
  • yes, the pale throat patch seems good for a RTD, but camera angle makes this hard to judge. Might well be easier with a side or a slightly front view
  • I have lost faith in colouration/pattern of the flanks as a feature in basic-plumaged birds. Yes, if the bird has dark(ish) flanks with a contrasting white patch on the rear tigh area (yes, it must be strightly in the right area) than I go for a BTD, but only then. So I skip this feature here.
  • Look, how long the head and the bill is. Even allowing for a foreshortening effect, this gives this bird a RTD jizz to me. But yes, it can be a pitfall picture of a BTD.
I must admit, this post came out more confident, than it is intendet to be. But yes, I am in the 1 cy Red-throated Diver-camp here, too.
Thanks for the thorough explanation, appreciate it, unfortunately these were the best I could manage, sea was extremely rough and windy.
 
ZEISS. Discover the fascinating world of birds, and win a birding trip to Columbia
ZEISS. Discover the fascinating world of birds, and win a birding trip to Colombia
ZEISS. Discover the fascinating world of birds, and win a birding trip to Colombia

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