Known estimates of 460 birds in 1981 and fewer than 100 individuals in 1983 from the Pajon Basin had dwindled to only one sighting of a male in October 1983. In 1983, a male was Broadbill was collected for captive propagation but failed as other wild individuals were not located and the captive male died of unknown causes. By the mid-1980s, the population continued to decline dramatically from undetermined causes. Instead, studies conducted implicated predation by the brown tree snake as the single most important factor in the decline of Guam's native forest birds, including the Guam Broadbill. The Guam Broadbill was listed as an endangered species on August 27, 1984.
All available information indicates that the Guam Broadbill is extinct.
The Service is proposing to remove the Guam Broadbill from the Federal List of Endangered and Threatened Wildlife. None at this time.