A half of a year into the search, the team had sound recordings of putative ivorybills and Rolek and Hicks had seen the birds and documented their sightings in writing. But skeptics were demanding irrefutable proof, and Hill and his team lacked anything that was irrefutable. This chapter discusses the sort of evidence that could support the existence of ivorybills, including sound recordings, large cavities, and scraped bark on trees. Methods for gathering all of these types of evidence are presented. The bottom line was, however, that only a clear video or photograph could definitively document the existence of such a rare bird.
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