Knowledge (XXG)

Sandwich tern

Source πŸ“

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The Sandwich tern is a medium-large tern with grey upperparts, white underparts, a yellow-tipped black bill, and a shaggy black crest which becomes less extensive in winter with a white crown. Young birds bear grey and brown scalloped plumage on their backs and wings. It is a vocal bird. It nests in
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in appearance, but usually with a more delicate, lighter build and shorter, weaker legs. They have long, pointed wings, which gives them a fast buoyant flight, and often a deeply forked tail. Most species are grey above and white below, and have a black cap which is reduced or flecked with white in
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The Sandwich tern's thin, sharp bill is black with a yellow tip. Its short legs are black. Its upper wings are pale grey and its underparts white, and this tern looks very pale in flight, although the primary flight feathers darken during the summer. In winter, the adult Sandwich tern's forehead
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This species breeds in very dense colonies on coasts and islands, and exceptionally inland on suitable large freshwater lakes close to the coast. It nests in a ground scrape and lays one to three eggs. Unlike some of the smaller white terns, it is not very aggressive toward potential predators,
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is more similar to the Sandwich tern, but has a reversal of the bill colour, yellow with a black tip; it does not overlap in range with the Sandwich tern so confusion is unlikely. Cabot's tern is the most similar, sharing the black bill with a yellow tip, but differs in the bill being obviously
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The Sandwich tern has an extensive global range estimated at 100,000–1,000,000 km (39,000–386,000 sq mi). It has a population estimated at 460,000–500,000 individuals. Population trends have not been quantified, but the species is not believed to approach the thresholds for the
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terns, the Sandwich tern feeds by plunge-diving for fish, almost invariably from the sea. It usually dives directly, and not from the "stepped-hover" favoured by Arctic terns. The offering of fish by the male to the female is part of the courtship display.
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stouter, and also differs in moult timing, losing its black forehead earlier in the summer. Its juveniles also lack the scaly pattern of Sandwich tern, being a plainer grey (though this can be confused with first-winter plumage of Sandwich tern).
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studies which confirmed that the three types of head pattern (white crown, black cap, and black cap with a white blaze on the forehead) found among the terns corresponded to distinct clades. The current genus name is derived from
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becomes extensively white. Juvenile Sandwich terns have dark tips to their tails, an all-blackish bill (lacking the yellow tip, but sometimes yellowish at the base) and a scaly appearance on their back and wings, like juvenile
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The lesser crested tern and elegant tern differ in having all-orange bills; lesser crested also differs in having a grey rump and marginally stouter bill, and elegant in having a slightly longer, more slender bill. The
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This is a medium-large tern, 36–41 cm (14–16 in) long with an 95–105 cm (37–41 in) wingspan, which is unlikely to be confused within most of its range. The weight ranges from 200-300 g.
571:) applies. Parties to the agreement are required to engage in a wide range of conservation actions, which are describes in a detailed action plan. This plan should address key issues such as species and 547: 722:
Bridge, Eli S.; Jones, Andrew W.; Baker, Allan J. (2005). "A phylogenetic framework for the terns (Sternini) inferred from mtDNA sequences: implications for taxonomy and plumage evolution".
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population decline criterion of the IUCN Red List (i.e., declining more than 30% in ten years or three generations). For these reasons, the species is evaluated as least concern.
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terns, the Sandwich tern feeds by plunge diving for fish, usually in marine environments, and the offering of fish by the male to the female is part of the courtship display.
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relying on the sheer density of the nestsβ€”often only 20–30 cm (7.9–11.8 in) apart and nesting close to other more aggressive species such as
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Handbook of the Birds of Europe, the Middle East and North Africa: the birds of the Western Palearctic. Volume 4: Terns to woodpeckers
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The Sandwich tern is among the taxa to which the Agreement on the Conservation of African-Eurasian Migratory Waterbirds (
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This bird has no subspecies. Two former subspecies are now treated as a separate species,
302:) and has been known to interbreed with both elegant and lesser crested. It breeds in the 142: 1517: 1322: 674: 410: 287: 735: 1618: 1605: 1113: 945: 919: 399: 388: 1744: 1382: 683: 418: 376: 75: 70: 1260: 1571: 1273: 1066: 446: 380: 315: 295: 17: 1247: 1597: 1544: 1709: 1688: 1413: 1395: 1343: 1157: 1105: 743: 606: 502: 311: 1512: 1082: 633: 371: 303: 162: 924:
Agreement on the conservation of African-Eurasian migratory Waterbirds (AEWA)
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The Sandwich tern is a vocal bird; its call is a characteristic loud grating
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Living with gulls: trading of food and predation in the Sandwich Tern
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The Birds of the Western Palearctic (BWP) concise edition (2 volumes)
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The Sandwich tern was originally described by ornithologist
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Garner, Martin; Lewington, Ian; Crook, Jason (2007).
1528: 1132: 829:. Oxford: Oxford University Press. pp. 48βˆ’62. 765:Snow, David; Perrins, Christopher M., eds. (1998). 456:A Sandwich tern (left, with a deformed bill) among 698:10.2305/IUCN.UK.2019-3.RLTS.T22694591A154517364.en 1063:at Neotropical Birds (Cornell Lab of Ornithology) 769:. Oxford: Oxford University Press. p. 764. 353:The terns are small to medium-sized seabirds, 49:Adult in breeding plumage, Northumberland, UK 590:approaching its waiting offspring with a fish 8: 975:Olsen, Klaus Malling; Larsson, Hans (1995). 793:The Helm Dictionary of Scientific Bird Names 717: 715: 330:a ground scrape and lays one to three eggs. 1120: 1112: 1007:11370/51438613-1ca3-4f4c-8cf1-5933785422a7 888:"Identification of American Sandwich Tern" 398:, which, like the English name, refers to 211: 64: 40: 31: 1806:Taxa named by John Latham (ornithologist) 696: 417:); this breeds on the Atlantic coasts of 861:. London: Dorling Kindersley. pp.  662: 577: 519: 1786:Birds of islands of the Atlantic Ocean 850: 848: 846: 1336:sandwich-tern-thalasseus-sandvicensis 796:. London: Christopher Helm. pp.  724:Molecular Phylogenetics and Evolution 369:, but was moved to its current genus 7: 1624:79fe9969-4017-4917-b610-06560e248806 1001:(PhD Thesis). University Groningen. 950:African-Eurasian Waterbird Agreement 270:. It is very closely related to the 1751:IUCN Red List least concern species 684:IUCN Red List of Threatened Species 349:Sandwich tern in flight, Dorset, UK 449:but with less black on the crown. 25: 1079:Audio recordings of Sandwich tern 977:Terns of Europe and North America 858:RSPB Birds of Britain and Europe 640: 625: 613: 595: 580: 546: 534: 522: 89: 1776:Birds of the Dominican Republic 1096:Field Guide: Birds of the World 1021:BirdLife species factsheet for 673:BirdLife International (2019). 553:Sandwich tern looking for prey 1: 1791:Birds of subantarctic islands 1061:Sandwich tern species account 1057:at VIREO (Drexel University) 979:. London: Christopher Helm. 632:Sandwich terns on the dune, 1055:Sandwich tern photo gallery 994:Stienen, Eric W.M. (2006). 744:10.1016/j.ympev.2004.12.010 541:Plunge-diving Sandwich tern 529:Plunge-diving Sandwich tern 1822: 647:Sandwich terns resting in 1067:Interactive range map of 1030:"Thalasseus sandvicensis" 901:: 273–287. Archived from 790:Jobling, James A (2010). 691:: e.T22694591A154517364. 233: 226: 219: 210: 191: 184: 86:Scientific classification 84: 62: 53: 48: 39: 34: 1047:Internet Bird Collection 952:. UNEP/ AEWA Secretariat 926:. UNEP/ AEWA Secretariat 220:Green: breeding colonies 1801:Birds described in 1787 1518:Thalasseus-sandvicensis 1164:Thalasseus sandvicensis 1134:Thalasseus sandvicensis 1090:Thalasseus sandvicensis 1069:Thalasseus sandvicensis 1023:Thalasseus sandvicensis 677:Thalasseus sandvicensis 259:Thalasseus sandvicensis 195:Thalasseus sandvicensis 1781:Birds of South America 1771:Birds of the Caribbean 492: 461: 437: 350: 222:Blue: wintering range 1761:Birds of Central Asia 1474:Paleobiology Database 1042:"Sandwich tern media" 490: 455: 432: 348: 1619:Fauna Europaea (new) 573:habitat conservation 509:to avoid predation. 467:Chinese crested tern 458:lesser crested terns 280:Chinese crested tern 177:T. sandvicensis 1559:sterna-sandvicensis 1530:Sterna sandvicensis 1189:Sterna_sandvicensis 998:Sterna sandvicencis 823:Sterna sandvicensis 821:Cramp, S. (1985). " 736:2005MolPE..35..459B 367:Sterna sandvicensis 272:lesser crested tern 236:Sterna sandvicensis 56:Conservation status 18:Sterna sandvicensis 1074:IUCN Red List maps 507:black-headed gulls 493: 491:Sandwich tern call 462: 438: 379:, 1822) following 351: 1738: 1737: 1461:Open Tree of Life 1126:Taxon identifiers 855:Hume, R. (2002). 836:978-0-19-857507-8 807:978-1-4081-2501-4 488: 433:Eggs, Collection 250: 249: 79: 16:(Redirected from 1813: 1731: 1730: 1718: 1717: 1705: 1704: 1692: 1691: 1689:NBNSYS0000000363 1679: 1678: 1666: 1665: 1653: 1652: 1640: 1639: 1627: 1626: 1614: 1613: 1601: 1600: 1588: 1587: 1575: 1574: 1562: 1561: 1549: 1548: 1547: 1521: 1520: 1508: 1507: 1495: 1494: 1482: 1481: 1469: 1468: 1456: 1455: 1443: 1442: 1430: 1429: 1417: 1416: 1414:NHMSYS0021274181 1404: 1403: 1391: 1390: 1378: 1377: 1365: 1364: 1352: 1351: 1339: 1338: 1326: 1325: 1316: 1315: 1303: 1302: 1290: 1289: 1277: 1276: 1264: 1263: 1251: 1250: 1241: 1240: 1228: 1227: 1215: 1214: 1205: 1204: 1202:04B49AE78FFF9B68 1192: 1191: 1179: 1178: 1168: 1167: 1166: 1153: 1152: 1151: 1121: 1116: 1051: 1037: 1010: 990: 962: 961: 959: 957: 942: 936: 935: 933: 931: 916: 910: 909: 907: 892: 883: 877: 876: 852: 841: 840: 825:Sandwich Tern". 818: 812: 811: 787: 781: 780: 762: 756: 755: 719: 710: 709: 707: 705: 700: 670: 644: 629: 617: 599: 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946:"Introduction" 937: 911: 908:on 2014-10-23. 878: 871: 842: 835: 813: 806: 782: 775: 757: 730:(2): 459–469. 711: 661: 660: 658: 655: 654: 653: 646: 639: 637: 631: 624: 622: 619: 612: 610: 601: 594: 592: 586: 579: 560: 557: 556: 555: 552: 545: 543: 540: 533: 531: 528: 521: 497: 494: 426: 423: 415:T. acuflavidus 400:Sandwich, Kent 342: 339: 292:T. acuflavidus 276:T. bengalensis 266:in the family 248: 247: 231: 230: 224: 223: 217: 216: 208: 207: 200: 189: 188: 182: 181: 174: 172: 168: 167: 160: 156: 155: 150: 146: 145: 140: 136: 135: 130: 126: 125: 120: 116: 115: 110: 106: 105: 100: 96: 95: 82: 81: 63: 60: 59: 54: 51: 50: 46: 45: 37: 36: 35:Sandwich tern 26: 24: 14: 13: 10: 9: 6: 4: 3: 2: 1818: 1807: 1804: 1802: 1799: 1797: 1794: 1792: 1789: 1787: 1784: 1782: 1779: 1777: 1774: 1772: 1769: 1767: 1764: 1762: 1759: 1757: 1754: 1752: 1749: 1748: 1746: 1729: 1724: 1720: 1716: 1711: 1707: 1703: 1698: 1694: 1690: 1685: 1681: 1677: 1672: 1668: 1664: 1659: 1655: 1651: 1646: 1642: 1638: 1633: 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Index

Sterna sandvicensis

Conservation status
Least Concern
IUCN 3.1
Scientific classification
Edit this classification
Eukaryota
Animalia
Chordata
Aves
Charadriiformes
Laridae
Thalasseus
Binomial name
Latham

Synonyms
Gmelin
tern
Laridae
lesser crested tern
Chinese crested tern
Cabot's tern
elegant tern
Palearctic
Europe
Caspian Sea
South Africa
India

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