Checklist S35689530

Sharing links

Owner Guillermo Funes

Traveling
  • 9
  • 4 km
Checklist Comments

Boat trip, from AMBAS office, to bocana el zapote
High tide

Submitted from eBird Android, version 1.5.2

Observations

  1. Number observed: 10
  2. Number observed: 2
    Media:
  3. Number observed: 4
  4. Number observed: 6
  5. Number observed: 5
  6. Number observed: 60
    Media:
  7. Number observed: 15
    Media:
  8. Number observed: 30
  9. Number observed: 10
  10. Number observed: 2
    Media:
  11. Number observed: 3
  12. Number observed: 3
  13. Number observed: 40
  14. Number observed: 800
  15. Number observed: 105
    Media:
  16. Number observed: 1

    Details: **Megarare. Possibly the third country record and first locality record. First spotted by Julio Acosta and Guillermo Funes in a distant gull flock on the exposed mudflats near the bocana, then we approached slowly for photos. Identified to subspecies by fairly large size, and some light gray feathering (new) on wing coverts (suggested by Nick Komar). First cycle individual (with some fresher feathers on wing coverts), with distinctly two-toned bill (blacksih tip). Legs greenish-gray. Notably larger than Leucophaeus atricilla and Thalasseus maximus, but not as much so as Larus argentatus. Multiple photos were posted to North American Gulls Facebook group. Initial ID made by OK, and then ID was confirmed from photos by Alvaro Jaramillo and Nick Komar. --O.Komar

    Age & Sex:
    Juvenile Immature Adult Age Unknown
    Male
    Female
    Sex Unknown 1
    Media:
  17. Number observed: 1
    Media:
  18. Herring x Kelp Gull (hybrid)

    Number observed: 1

    Details: Continuing bird. The identification of this gull has been debated on the North American Gulls Facebook Group for many months, since June 2016 when first reported by Enrique Choussy. It was first thought to be a Western Gull (Larus occidentalis), then a Yellow-footed Gull (Larus livens), then occidentalis again, but the somewhat flat headed look and light yellowish-pink legs have always cast doubts. The article in Birding by Dittman and Cardiff (2005) about identification of Chandeleur Gulls, however, indicates that an adult F1 Herring x Kelp hybrid should look pretty much just like this bird. The only "difference" is the yellow orbital ring, which is usually dark or reddish on the Chandeleur type hybrid, but according to the article ranges in color from dark red to occasionally yellow. This bird is not quite adult, and therefore is presumably ending its third cycle. It is not yet molting its flight feathers (except for two new primaries on the left wing, possibly due to accidental feather loss). It still has remnants of a dusky tip to the bill, although it already has a large red spot on the mandible (like an adult). The outer primaries are still mostly dark, not showing the white spots of an adult. Since everything else can be ruled out, this bird should be considered a Chandeleur Gull, which is not too surprising, considering that the hundreds or thousands of Laughing Gulls (Leucophaeus atricilla) that winter and migrate through this location are expected to cross the Isthmus to the Gulf of Mexico, and many of them also breed in the Chandeleur Islands.

    Media:
  19. gull sp.

    Number observed: 2

    Details: Fotos taken

  20. Number observed: 2
  21. Number observed: 2
  22. Number observed: 350
  23. Number observed: 5
    Media:
  24. Number observed: 345

    Details: Counted

    Media:
  25. Number observed: 8

    Details: Female

  26. Number observed: 2
  27. Number observed: 7
  28. Number observed: 2
  29. Number observed: 1
  30. Number observed: 10
  31. Number observed: 6
  32. Number observed: 10
    Media:
  33. Number observed: 4
  34. Number observed: 4
  35. Number observed: 4
  36. Number observed: 66

    Details: Juvenile

  37. Number observed: 1
  38. Number observed: 4
  39. Number observed: 1
    Media:
  40. Number observed: 1
  41. Number observed: 1
  42. Number observed: 1
  43. Number observed: 1
  44. Number observed: 1
    Media:
  45. Number observed: 2
  46. Number observed: 3
  47. Number observed: 1
  48. Number observed: 5
  49. Number observed: 1
  50. Number observed: 1
Media powered by Macaulay Library