Ask A Birder: Photograph Or Illustration?
36 minutes ago
Birding. All the time.
Skin Design:
Free Blogger Skins
This morning I stopped by Peace Valley Park on my way to work and was greeted by a stunning winter-plumaged male Long-tailed Duck floating in the middle of the lake with the large Common Merganser flock. This is mostly a coastal bird, so not one you see very often here inland. Also present were three Northern Pintail, and half dozen Ruddy Ducks and Ring-necked Ducks, also a lone male Bufflehead. Birds are on the move! (photo: Indiana Audubon Society)
Background: The apparent rediscovery of the Ivory-billed Woodpecker Campephilus principalis in Arkansas, USA, previously feared extinct, was supported by video evidence of a single bird in flight (Fitzpatrick et al, Science 2005, 308:1460-1462). Plumage patterns and wingbeat frequency of the putative Ivory-billed Woodpecker were said to be incompatible with the only possible confusion species native to the area, the Pileated Woodpecker Dryocopus pileatus.
Results: New video analysis of Pileated Woodpeckers in escape flights comparable to that of the putative Ivory-billed Woodpecker filmed in Arkansas shows that Pileated Woodpeckers can display a wingbeat frequency equivalent to that of the Arkansas bird during escape flight. The critical frames from the Arkansas video that were used to identify the bird as an Ivory-billed Woodpecker are shown to be equally, or more, compatible with the Pileated Woodpecker.
Conclusions: The identification of the bird filmed in Arkansas in April 2004 as an Ivory-billed Woodpecker is best regarded as unsafe. The similarities between the Arkansas bird and known Pileated Woodpeckers suggest that it was most likely a Pileated Woodpecker.

Public data entry for the Great Backyard Bird Count ended last week, but behind the scenes there is still a lot of work to do. We have over 90 regional reviewers sifting through the unusual records and trying to clean up the data. We are still missing reports of many species, especially in Hawaii--so we're contacting observers there who might have additional species to report. We're also starting to look at the results from this year--including some interesting trends. Northern Pintail numbers are down, which may be further evidence that this species is continuing its precipitous population decline. Hooded Merganser numbers are way up this year, so there might be something intersting going on there. American Crow numbers are down a bit on a per checklist basis, perhaps indicating continued problems with West Nile Virus mortality. 

