The avifauna of Biak Island, Papua, Indonesia with comments on status, conservation, natural history and taxonomy Author Bishop, K. David text Bulletin of the British Ornithologists’ Club 2023 2023-03-06 143 1 3 62 journal article 298463 10.25226/bboc.v143i1.2023.a2 6028cf6b-e944-40d1-b774-7caa1c970409 2513-9894 11642130 805136AB-F3FE-4C77-85AC-E37423156B6D **BLACK-HEADED GULL Chroicocephalus ridibundus Status Vagrant. Scarce Palearctic migrant to New Guinea waters (Beehler & Pratt 2016) with just two records on Biak. 29‒30 March 1963: an immature in Biak harbour (King 1979); February 1991: eight at Biak wharf (Gibbs 1993).