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Tony Leukering

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Everything posted by Tony Leukering

  1. Narrow white bands on black tail on a wide-winged raptor -- straightforward for RSHA
  2. Always in powered or gliding flight, and in all birds, unless they're maneuvering. A spread tail in flight creates drag -- bad, bad, bad.
  3. In Colorado, if it's winter -- or near winter (say, Nov - Mar) -- and your unknown sparrow is streaked below -- go with Song. You'll be right >99.9% of the time.
  4. Unless you're discussing juvenile Turkey Vultures, which have black heads.
  5. FYI: https://cobirds.org/CFO/ColoradoBirds/InTheScope/84.pdf
  6. Other than date (which was not mentioned), I don't see how one would rule out sordida. When I worked on San Clemente Island, the local OCWAs (referable to sordida) seemed to vanish post-breeding and I've wondered since if some might head to the mainland. I don't know what the collecting history of the two West Coast forms is in the non-breeding seasons, but....
  7. Ring-billed See https://cobirds.org/CFO/ColoradoBirds/InTheScope/17.pdf
  8. Also note that the tertials extend nearly all the way to the tail tip. On Lesser, the tertials end well up the tail.
  9. First-cycle Great Black-backed -- juvenile wing feathers (thus, window in inner primaries) and juvenile tail (black terminus on white tail), extensively white below, bill all or nearly all dark
  10. In flight, note the only the toes project beyond the tail; on Lesser, more than just the toes projects. The difference between the two is quite similar to that between Black-crowned and Yellow-crowned night-herons.
  11. None of the accipiters have such striking white markings on wings. Additionally, any accipiter with barring below (thus, an adult) will have a dark crown contrasting more or less strongly with the face, unlike both Red-shouldered and Broad-winged hawks.
  12. Northern Mockingbird; the side feathers are covering the wing bars
  13. First could be a Glaucous-winged Thing, while the second has at least some Western Gull in its ancestry, possibly a lot.
  14. Lastly, to get to Bachman's Warbler, you'd have to ignore the extensive white in the tail and the strong white supercilium. Bird ID is not just finding a character or two in the field guide, it also involves ruling out EVERYTHING ELSE.
  15. That's entirely due to the odd posture. Watch a bird move for a while and you will see all sorts of changes in the shapes of field characters.
  16. Barred Owl? Perhaps the upper chest feathers -- https://macaulaylibrary.org/asset/217601641#_ga=2.100140766.1948673611.1584928130-334541348.1399337695
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