The U.S. Fish and Wildlife Service says experts disagree strongly about whether ivory-billed woodpeckers are extinct, and it's putting off a final decision on the question to review information.The bird with a 30-inch wingspan and a high, nasal call was among 23 animals the agency said last year it was planning to declare extinct.On Wednesday, it announced a six-month delay for a decision on the ivory-billed woodpecker.It also is reopening public comment for one month, and the agency is looking for new photos or videos that are so clear that independent observers all agree they show the birds.Arkansas SightingsA research team claimed in 2005 it had made multiple sightings of a male ivory-billed woodpecker in a swamp forest in eastern Arkansas, according to the Encyclopedia of Arkansas. The report led to a tourism boom in Brinkley. Arkansas offers a specialty license plate with an ivory-billed woodpecker design.But not all scientists accepted the finding. There have been sporadic sightings of the bird in Arkansas and Louisiana for decades, but none have been universally accepted since 1944.The bird remains a source of rumor and legend in Arkansas, with skeptics and believers debating the existence of the bird, according to National Geographic. Spotting The WoodpeckerThe Cornell Lab website details the features of an ivory-billed woodpecker. The woodpecker is about the size of a crow and can resemble a pileated woodpecker.About the size of a crow, the species is mostly black but has white stripes and panels that you can see even when the wings are folded.