{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,12]],"date-time":"2026-05-12T14:01:52Z","timestamp":1778594512266,"version":"3.51.4"},"reference-count":57,"publisher":"Cambridge University Press (CUP)","issue":"8","license":[{"start":{"date-parts":[[2010,6,17]],"date-time":"2010-06-17T00:00:00Z","timestamp":1276732800000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/www.cambridge.org\/core\/terms"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J. Mar. Biol. Ass."],"published-print":{"date-parts":[[2010,12]]},"abstract":"<jats:p>Killer whales<jats:italic>Orcinus orca<\/jats:italic>are considered to be relatively uncommon in tropical waters. Few sightings have been reported from the west coast of Africa due to a paucity of survey coverage. We present data on 32 killer sightings from tropical waters off Angola (N\u00a0=\u00a018), Gabon (N\u00a0=\u00a07), S\u00e3o Tom\u00e9 (N\u00a0=\u00a06) and Cameroon (N\u00a0=\u00a01), comprising a combination of dedicated survey sightings (N\u00a0=\u00a021) and reliable anecdotal records (<jats:italic>n<\/jats:italic>\u00a0=\u00a011). Killer whales were reported from coastal waters, the shelf edge and deep, oceanic areas. Sightings indicate a probable year-round occurrence of killer whales within the region. Mean group size was 5.6 animals. There was no difference in group size between sightings in waters &gt;200\u00a0m deep and those on the continental shelf. No photo-identification matches were found between Angola, Gabon and S\u00e3o Tom\u00e9. Re-sightings of two individuals occurred annually in S\u00e3o Tom\u00e9 during 2002\u20132004. Killer whales had external appearance consistent with the Type A nominate species form. Antagonistic encounters were recorded between killer whales and humpback whales<jats:italic>Megaptera novaeangliae<\/jats:italic>off Angola, Gabon and Cameroon, and with sperm whales<jats:italic>Physeter macrocephalus<\/jats:italic>off Angola. Predation on ocean sunfish<jats:italic>Mola mola<\/jats:italic>was recorded in S\u00e3o Tom\u00e9, and possible predation on sharks was recorded twice in Gabon.<\/jats:p>","DOI":"10.1017\/s002531541000072x","type":"journal-article","created":{"date-parts":[[2010,6,17]],"date-time":"2010-06-17T09:36:31Z","timestamp":1276767391000},"page":"1601-1611","source":"Crossref","is-referenced-by-count":30,"title":["Killer whales (<i>Orcinus orca<\/i>) in Angolan and Gulf of Guinea waters, tropical West Africa"],"prefix":"10.1017","volume":"90","author":[{"given":"Caroline R","family":"Weir","sequence":"first","affiliation":[]},{"given":"Tim","family":"Collins","sequence":"additional","affiliation":[]},{"given":"In\u00eas","family":"Carvalho","sequence":"additional","affiliation":[]},{"given":"Howard C.","family":"Rosenbaum","sequence":"additional","affiliation":[]}],"member":"56","published-online":{"date-parts":[[2010,6,17]]},"reference":[{"key":"S002531541000072X_ref45","doi-asserted-by":"publisher","DOI":"10.1111\/j.1748-7692.1996.tb00595.x"},{"key":"S002531541000072X_ref46","first-page":"231","article-title":"Distribution and behavior of killer whales Orcinus orca off the coasts of Southern Africa","volume":"20","author":"Rice","year":"1987","journal-title":"Investigations on Cetacea"},{"key":"S002531541000072X_ref29","unstructured":"IUCN (2008) 2008 IUCN Red List of Threatened Species. <www.iucnredlist.org>. 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