Knowledge (XXG)

Cape gannet

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425: 377: 465: 94: 457: 479: 69: 31: 45: 341:, appeared about 30 million years ago. Early Sulidae fossils most resembled the boobies, although they were more aquatic, with the gannets splitting off later, about 16 million years ago. The gannets evolved in the northern hemisphere, later colonising the southern oceans. The most ancient extant species may be the 313:
is pointed with fine serrations near the tip; perhaps because of the depth and speed of the gannet's dive when fishing (depending on altitude, gannets hit the water at speeds of between 40 and 120 km/h (25 and 75 mph)), its beak has no external nostrils into which the water might be forced.
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When seen in flight the snow-white body with the black tail, primaries and secondaries, and dark bill makes them easy to identify. At closer range the distinctive golden crown and nape, which gradually becomes white on the neck, is noticeable. Juveniles and immatures are dark brown with a pale bill,
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Numbers of Cape gannets at the Namibian islands have declined considerably between 1956 and 2000 from 114,600 to 18,200 breeding pairs respectively, an 84% decrease in less than fifty years. This contrasts with the trends at the South African islands where numbers have increased about 4.3 times
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The hatchling is black, naked and blind, it weighs only about 70 g (2.5 oz), but within three weeks its body mass is one third of that of an adult. At eight weeks the chick outweighs the adult, and this remains so until it becomes a fledgling at 95–105 days of age.
444:, which soon becomes soiled. Both parents are actively involved in the incubation process which lasts for 42 to 46 days until hatching. Gannets use their foot webs to incubate the egg. The foot webs, which are richly irrigated with blood vessels are wrapped around the egg. 874: 408:
by the all-black tail, a longer black stripe down the throat (from underneath the beak) and more extensive black on the face, but all of these features are difficult to identify unless at close proximity. The Cape gannet is also very similar to the
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coast, well within the regular wintering range of the species. As a result, they recommended that the Cape gannet be deleted from the Western Palearctic list. However, on 14 April 2016, a Cape gannet was photographed at sea off
618:, with the offshore Western Saharan location being the result of an attempt to correct this to a more plausible location. A retransposition of the original latitude and longitude gives a location off the 631:, but there is yet to be an accepted record in the Western Palearctic apart from the Azores record. One Spanish record from 1985 has been accepted as either a Cape gannet or an Australasian gannet. 1006:
Vol. 1: Non-passerines. Harrison, J. A. Allan, D. G., Underhill. L. G., Herremans, M., Tree, A.J., Parker, V. & Brown, C.J. (eds), pp. 28–29. BirdLife South Africa, Johannesburg.
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Gannet pairs may remain together over several seasons. They perform elaborate greeting rituals at the nest, stretching their bills and necks skywards and gently tapping bills together.
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in the Azores. The species has been discussed as a possible vagrant to Britain and Ireland, and there have been a number of claimed sightings, including one in December 2020 off the
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suggests that the ancestor of the gannets arose around 2.5 million years ago before splitting into northern and southern lineages. The latter then splitting into the Cape and
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has been reported for the Cape gannet on several occasions, but until 2016 was believed to be unproven. Crochet and Haas examined the status of the species in the western
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on the east coast. They seldom occur farther offshore than 100 km, though records of birds more than 200 km offshore exist for both the
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Cape gannets are powerful fliers, using mainly a flap-gliding technique, which is more energy consuming than the dynamic-soaring favoured by
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Individuals have also been photographed in other locations far from the species' usual range, including off Peru in 1999 and Oman in 2004.
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in 1966. In relation to the latter bird, they conclude that a mistake had occurred; the original data placed the bird inland, in
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Proposal for inclusion of species in Annex 2 of the Agreement on the Conservation of African-Eurasian Migratory Waterbirds (
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Patterson, S.A.; Morris-Pocock, J.A.; Friesen, V.L. (2011). "A multilocus phylogeny of the Sulidae (Aves: Pelecaniformes)".
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Adults are about 84–94 cm (33–37 in) long and have a 171–185 cm (67–73 in) wingspan and weigh
2033: 1533: 1668: 1563: 1083: 969: 1176: 610:, and analyse the single record which had hitherto been widely accepted, a juvenile recovered offshore from 464: 1914: 1841: 1543: 624: 607: 527:. They normally nest in large and dense colonies on flat islands or on flat ledges of the steeply sloping 357:
around 0.5 million years ago. The three gannets are generally considered to be separate species forming a
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The breeding range of the Cape gannet is confined to six islands along the coast of Southern Africa, viz.
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del Hoyo, Josep; Elliott, Andrew; Sargatal, Jordi; Christie, David A.; de Juana, Eduardo, eds. (2013).
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Crochet, Pierre-AndrΓ© and Marcel Haas (2008). Western Palearctic list update: deletion of Cape Gannet
2209: 2131: 1976: 1906: 1718: 1678: 1648: 1062: 1056: 696: 323: 1879: 1673: 1640: 1439: 1343: 1076: 788: 556: 405: 354: 205: 58: 2196: 1816: 1568: 1196: 728: 263: 88: 2183: 2072: 345:, possibly the sole survivor of an otherwise extinct separate lineage. A 2011 genetic study of 2165: 2098: 1950: 1791: 1635: 1589: 1513: 1313: 1270: 1191: 796: 770: 595: 414: 350: 342: 2250: 2170: 1744: 1594: 1548: 1466: 1370: 1290: 1223: 1121: 762: 720: 670: 603: 487: 440:
Cape gannets begin breeding in August or September. Typically the clutch is a single bluish
1919: 1068: 2139: 1599: 1558: 1429: 1333: 1099: 516: 512: 410: 366: 231: 652: 535:. The world population was estimated in 1996 to number about 340,000 birds, with 12% in 2028: 2015: 1811: 1806: 1801: 1609: 1553: 1518: 1434: 1275: 837:
Paterson A.M. and N.J. Riddiford (1990). "Does the Cape Gannet Enter European Waters?"
611: 599: 571: 563: 528: 498:. As all Sulids, they are fish-eating birds that plunge-dive from considerable height. 456: 239: 235: 478: 2239: 2093: 1785: 1775: 1770: 1698: 1504: 867: 852: 824: 816: 732: 711: 661: 628: 544: 223: 78: 30: 2121: 1955: 1765: 1755: 1709: 1528: 1280: 575: 548: 540: 524: 358: 2007: 1942: 606:. They list a number of historical claims which had not been accepted by national 562:
The non-breeding range of the Cape gannet extends from the coastal waters off the
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They are easily identified by their large size, black and white
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during the same period, from 34,400 to 148,000 breeding pairs.
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and distinctive yellow crown and hindneck. The pale blue
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du Toit, M. & Cooper, J. (2002). Cape Gannet. In:
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Cape gannet, Bird Island, Lamberts Bay, South Africa
1645: 361:, though they have also formerly been classified as 1848: 1727: 1707: 1687: 1657: 1619: 1578: 1502: 1478: 1413: 1389: 1322: 1304: 1259: 1235: 1165: 1141: 710: 676:10.2305/IUCN.UK.2018-2.RLTS.T22696668A132587992.en 1047:– Avian Demography Unit, University of Cape Town 901:"The top 10 Western Palearctic vagrants of 2016" 1084: 8: 1836: 1484: 1475: 1457: 1395: 1386: 1361: 1241: 1232: 1214: 1147: 1138: 1112: 1091: 1077: 1069: 67: 43: 29: 20: 939:"Focus On: identification of Cape Gannet" 821:The Field Guide to the Birds of Australia 674: 970:"Review of the Week: 9-15 December 2020" 932: 930: 928: 873:(Report). Azores Bird Club. p. 22. 868:Azores Rare and Scarce Birds Report 2016 717:Handbook of the Birds of the World Alive 697:Beak Protects during Dives: Cape Gannet 643: 404:The Cape gannet is identified from the 980:from the original on 16 December 2020 949:from the original on 16 December 2020 913:from the original on 25 November 2020 880:from the original on 25 November 2020 795:. London: A&C Black. p. 18. 755:Molecular Phylogenetics and Evolution 712:"Family Suildae: Gannets and boobies" 7: 2132:b23fc66e-9fb2-4c89-b99c-c2db50e1b82f 2034:32e9183e-30a3-4e5b-b5db-62b482e139e2 1788:(imperial cormorant, blue-eyed shag) 937:Garner, Martin (26 September 2007). 515:of the Cape gannet is restricted to 1039:The Atlas of Southern African Birds 1017:. Avian Demography Unit, Cape Town. 1004:The Atlas of Southern African Birds 662:IUCN Red List of Threatened Species 390:and can resemble the dark-coloured 326:described the Cape gannet in 1823. 1002:Crawford (1997). Cape Gannet. In: 14: 866:Alfrey, Peter; Legrand, Vincent. 2246:IUCN Red List endangered species 1051:Fact file with images and movies 566:on the west coast of Africa, to 92: 968:Viles, Sam (16 December 2020). 899:Jones, Josh (21 January 2017). 651:BirdLife International (2018). 507:Breeding and non-breeding range 1015:, an agreement under UNEP/CMS) 1: 1187:Christmas Island frigatebird 1057:"Beak protects during dives" 719:. Barcelona: Lynx Edicions. 2261:Birds of Sub-Saharan Africa 767:10.1016/j.ympev.2010.11.021 401:2.6 kg (5.7 lb). 257: Extant (non-breeding) 228:Bird Island (Lambert's Bay) 2282: 1063:"Spinning makes safe dive" 1487: 1474: 1456: 1398: 1385: 1360: 1244: 1231: 1213: 1150: 1137: 1111: 669:: e.T22696668A132587992. 269: 262: 230:in South Africa. And the 217: 213: 194: 187: 89:Scientific classification 87: 65: 56: 51: 42: 37: 28: 23: 16:Species of diving seabird 2256:Birds of Southern Africa 1669:Double-crested cormorant 1564:White-breasted cormorant 1030:– BirdLife International 819:; Knight, Frank (2007). 2266:Birds described in 1823 1612:(long-tailed cormorant) 1177:Magnificent frigatebird 608:bird records committees 555:islands, together with 502:Status and distribution 251: Extant (breeding) 220:Bird Island (Algoa Bay) 1741:(Magellanic cormorant) 1571:(Temminck's cormorant) 1544:Little black cormorant 1106:(Phalacrocoraciformes) 725:10.2173/bow.sulida1.01 523:and three islands off 491: 475: 461: 429: 381: 52:Cape gannet in flight 2179:Paleobiology Database 1750:New Zealand king shag 1605:Little pied cormorant 1539:Black-faced cormorant 1182:Ascension frigatebird 519:in three islands off 481: 467: 459: 427: 380:Close-up of the head 379: 2029:Fauna Europaea (new) 1719:Red-legged cormorant 1679:Flightless cormorant 1649:Spectacled cormorant 1469:: Phalacrocoracidae) 1373:: Anhingidae · 1124:: Fregatidae · 557:Australasian gannets 482:Cape gannet colony, 355:Australasian gannets 324:Hinrich Lichtenstein 1674:Neotropic cormorant 1641:Red-faced cormorant 1440:Australasian darter 1344:Australasian gannet 1220:Gannets and boobies 460:Cape gannet landing 406:Australasian gannet 59:Conservation status 1817:South Georgia shag 1752:(rough-faced shag) 1631:Brandt's cormorant 1569:Japanese cormorant 1197:Lesser frigatebird 827:. pp. 102–03. 492: 476: 462: 430: 382: 322:German naturalist 2233: 2232: 2166:Open Tree of Life 1842:Taxon identifiers 1833: 1832: 1829: 1828: 1825: 1824: 1792:Heard Island shag 1636:Pelagic cormorant 1590:Crowned cormorant 1514:Socotra cormorant 1498: 1497: 1452: 1451: 1448: 1447: 1409: 1408: 1356: 1355: 1352: 1351: 1271:Blue-footed booby 1255: 1254: 1209: 1208: 1205: 1204: 1192:Great frigatebird 1161: 1160: 1028:Species factsheet 802:978-1-4081-3857-1 582:Population trends 415:blue-footed booby 394:at first glance. 351:mitochondrial DNA 278: 277: 244:Possession Island 206:Lichtenstein, MHC 82: 2273: 2226: 2225: 2213: 2212: 2200: 2199: 2187: 2186: 2174: 2173: 2161: 2160: 2148: 2147: 2135: 2134: 2125: 2124: 2115: 2114: 2102: 2101: 2089: 2088: 2076: 2075: 2063: 2062: 2050: 2049: 2037: 2036: 2024: 2023: 2011: 2010: 1998: 1997: 1985: 1984: 1972: 1971: 1959: 1958: 1946: 1945: 1936: 1935: 1923: 1922: 1910: 1909: 1907:775E93D7FC5685AC 1897: 1896: 1884: 1883: 1882: 1869: 1868: 1867: 1837: 1745:Guanay cormorant 1647: 1595:Little cormorant 1549:Indian cormorant 1485: 1476: 1458: 1396: 1387: 1362: 1291:Red-footed booby 1242: 1233: 1215: 1148: 1139: 1113: 1093: 1086: 1079: 1070: 990: 989: 987: 985: 965: 959: 958: 956: 954: 934: 923: 922: 920: 918: 896: 890: 889: 887: 885: 879: 872: 863: 857: 848: 842: 835: 829: 828: 813: 807: 806: 789:Nelson, J. 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Index



Conservation status
Endangered
IUCN 3.1
Scientific classification
Edit this classification
Eukaryota
Animalia
Chordata
Aves
Suliformes
Sulidae
Morus
Binomial name
Lichtenstein, MHC
Bird Island (Algoa Bay)
Malgas Island
Bird Island (Lambert's Bay)
Penguin Islands
Mercury Island
Ichaboe Island
Possession Island
Synonyms
seabird
gannet
Sulidae
plumage
bill
Hinrich Lichtenstein

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