The Palau owl (Pyrroglaux podargina) is one of three Palau bird species that were virtually eliminated by damage caused to the Palau Islands (formerly a U.S. administered United Nations Trust Territory now under an independent constitutional government) during WWII . Surveys conducted in 1945 found that the endemic owl, reported to be common in 1931, was scarce . The population is thought to have continued to decline until the 1960s, possibly due to deaths caused by the ingestion of an introduced beetle . Following efforts to control the introduced beetle (Oryctes rhinoceros), also a pest on coconut plantations, owl populations began to increase . A 1976-1976 survey found Palau owls to be abundant throughout the archipelago  and in 1985, the USFWS removed the Palau owl along with the Palau ground dove and Palau fantail flycatcher from the endangered species list .
 Noecker R.J. 1998. Congressional Research Service, Report for Congress: Endangered Species List Revisions: A Summary of Delisting and Downlisting. Made available by National Council for Science and the Environment. Washington D.C.
 Pratt H.D., J. Engbring, P.L. Bruner, and D.G. Berrett. 1980. 1976-1979 Notes on the taxonomy, natural history, and status of the resident birds of Palau. Condor 82(2): 117-131.