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Alula

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In most situations, the alula is held flush against the wing; however, it can be manipulated. When flying at slow speeds or landing, the bird moves its alula slightly upwards and forward, which creates a small slot on the wing's leading edge. This functions in the same way as the
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Sanz, J. L.; Chiappe, L. M.; Pérez-Moreno, B. P.; Buscalioni, A. D.; Moratalla, J. J.; Ortega, F.; Poyato-Ariza, F. J. (1996-08-01), "An Early Cretaceous bird from Spain and its implications for the evolution of avian flight",
173:, that forces the airflow over the wing to better bind to it. During stretching of the wing down toward the ground, the alula is abducted from the wing and can be clearly viewed. 985: 176:
In falcons, the alula is more prominent, and provides a degree of control when the wing is cupped or tucked in a dive/stoop. The alulae are particularly notable in
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found on the wing's trailing edge, these alula feathers are asymmetrical, with the shaft running closer to anterior edge.
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Zhang, Fucheng; Zhou, Zhonghe (8 December 2000), "A Primitive Enantiornithine Bird and the Origin of Feathers",
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on the leading edge of the wing of an aircraft, allowing the wing to achieve a higher than normal
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Laboratory of Behavioral Ecology and Evolution at Seoul National University (5 June 2015).
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Ehrlich, Paul R.; Dobkin, David S.; Wheye, Darryl; Pimms, Stuart L. (1994),
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This article is about the anatomy of a bird's wing. For other uses, see
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The presence of an alula has been confirmed in several now-
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are not closely related to modern birds, either the alula
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twice, or it did so more than 130 million years ago.
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Like the larger 518: 440: 8: 1686: 1607: 1598: 1589: 1327: 1173: 1160: 1121: 1117: 1090: 1029: 1025: 1014: 1010: 525: 511: 503: 447: 433: 425: 312: 120:, with the exact number depending on the 139: 36: 260: 27:Small projections on the wings of birds 41:Location of the alula on a bird's wing 7: 2084: 148:landing, showing the alula in action 2108: 25: 986:Late Quaternary prehistoric birds 2107: 2095: 2083: 2072: 2071: 1962:(New World vultures and condors) 50: 108:and means "winglet"; it is the 88:) is a small projection on the 1: 411:10.1126/science.290.5498.1955 2026:(woodpeckers and relatives) 336:, Oxford University Press, 2157: 1888:(cormorants and relatives) 981:Extinct species since 1500 332:The Birdwatcher's Handbook 29: 2067: 2018:(kingfishers and rollers) 1872:(albatrosses and petrels) 1756:(swifts and hummingbirds) 1738:(nightjars and relatives) 1588: 1562:(pheasants and relatives) 1120: 1089: 1028: 1024: 1013: 1009: 545: 462: 217:Protopteryx fengningensis 165:– without resulting in a 1917:(seriemas and relatives) 1896:(pelicans and relatives) 2010:(hornbills and hoopoes) 1925:(falcons and relatives) 124:. There also are minor 1994:(trogons and quetzals) 1806:(cranes and relatives) 1076:(emus and cassowaries) 966:Glossary of bird terms 778:Confuciusornithiformes 149: 42: 32:Alula (disambiguation) 1835:(kagu and sunbittern) 1798:(gulls and relatives) 803:Songlingornithiformes 768:Omnivoropterygiformes 313:Zhang & Zhou 2000 238:Alular digit homology 192:ancient relatives of 143: 40: 1657:Phoenicopteriformes 1628:Mesitornithiformes 1622:(doves and pigeons) 956:Families and orders 818:Ichthyornithiformes 793:Patagopterygiformes 403:2000Sci...290.1955Z 397:(5498): 1955–1959, 367:1996Natur.382..442S 268:Ehrlich et al. 1994 102:non-avian dinosaurs 1970:(eagles and hawks) 1870:Procellariiformes 1775:Opisthocomiformes 1744:Steatornithiformes 971:List by population 808:Hongshanornithidae 733:Evolution of birds 214:) and the earlier 150: 43: 2123: 2122: 2063: 2062: 2059: 2058: 2055: 2054: 2051: 2050: 2047: 2046: 2043: 2042: 2039: 2038: 2035: 2034: 1856:(loons or divers) 1825:Phaethontiformes 1817:Phaethontimorphae 1767:Opisthocomiformes 1736:Caprimulgiformes 1676: 1675: 1665:Podicipediformes 1584: 1583: 1580: 1579: 1576: 1575: 1302: 1301: 1085: 1084: 1042:Struthioniformes 910:Waterfowl hunting 843:Gastornithiformes 838:Aepyornithiformes 828:Lithornithiformes 500: 499: 361:(6590): 442–445, 248:Leading edge slot 199:Eoalulavis hoyasi 178:peregrine falcons 16:(Redirected from 2148: 2111: 2110: 2099: 2087: 2086: 2075: 2074: 2027: 2019: 2011: 2003: 2000:Leptosomiformes 1995: 1987: 1979: 1971: 1968:Accipitriformes 1963: 1942: 1941:(perching birds) 1934: 1926: 1918: 1897: 1889: 1881: 1873: 1865: 1862:Sphenisciformes 1857: 1836: 1828: 1807: 1799: 1796:Charadriiformes 1778: 1757: 1739: 1718: 1710: 1707:Musophagiformes 1702: 1687: 1668: 1660: 1639: 1631: 1623: 1608: 1599: 1590: 1563: 1550: 1328: 1324: 1317: 1230: 1223: 1187: 1174: 1170: 1161: 1157: 1122: 1118: 1091: 1077: 1069: 1061: 1053: 1045: 1030: 1026: 1015: 1011: 878:Bird collections 833:Dinornithiformes 738:Darwin's finches 728:Origin of flight 668:Seabird breeding 658:Sexual selection 527: 520: 513: 504: 449: 442: 435: 426: 421: 385: 375:10.1038/382442a0 346: 335: 315: 310: 304: 302:Sanz et al. 1996 299: 293: 292: 290: 288: 277: 271: 265: 184:In ancient birds 171:vortex generator 79: 78: 75: 74: 71: 68: 65: 62: 59: 56: 21: 2156: 2155: 2151: 2150: 2149: 2147: 2146: 2145: 2126: 2125: 2124: 2119: 2031: 2025: 2017: 2009: 2008:Bucerotiformes 2002:(cuckoo-roller) 2001: 1993: 1985: 1977: 1969: 1961: 1960:Cathartiformes 1946: 1940: 1932: 1931:Psittaciformes 1924: 1916: 1901: 1895: 1894:Pelecaniformes 1887: 1879: 1871: 1863: 1855: 1840: 1834: 1833:Eurypygiformes 1826: 1811: 1805: 1797: 1782: 1776: 1761: 1755: 1737: 1722: 1716: 1708: 1700: 1672: 1666: 1658: 1643: 1637: 1636:Pterocliformes 1629: 1621: 1572: 1561: 1548: 1533: 1457: 1416: 1354: 1319: 1318: 1311: 1310: 1298: 1278: 1251: 1228: 1221: 1181: 1180: 1168: 1167: 1151: 1150: 1147: 1145: 1143: 1141: 1139: 1137: 1135: 1133: 1131: 1129: 1127: 1112: 1110: 1108: 1106: 1104: 1102: 1100: 1098: 1096: 1081: 1075: 1074:Casuariiformes 1067: 1066:Apterygiformes 1059: 1051: 1043: 1020: 1005: 976:Lists by region 944: 854: 847: 788:Chaoyangiformes 773:Jeholornithidae 747: 711:Origin of birds 697: 678:Brood parasites 624: 554: 541: 531: 501: 496: 482:flight feathers 458: 453: 388: 349: 344: 327: 324: 319: 318: 311: 307: 300: 296: 286: 284: 279: 278: 274: 266: 262: 257: 234: 204:enantiornithine 186: 159:angle of attack 138: 130:flight feathers 126:covert feathers 118:flight feathers 104:. 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Since these 185: 182: 137: 134: 26: 24: 14: 13: 10: 9: 6: 4: 3: 2: 2153: 2142: 2139: 2137: 2134: 2133: 2131: 2116: 2115: 2106: 2104: 2103: 2098: 2094: 2092: 2091: 2082: 2080: 2079: 2070: 2069: 2066: 2028: 2022: 2020: 2014: 2012: 2006: 2004: 1998: 1996: 1990: 1988: 1982: 1980: 1976:Strigiformes 1974: 1972: 1966: 1964: 1958: 1957: 1955: 1953: 1949: 1943: 1937: 1935: 1929: 1927: 1921: 1919: 1913: 1912: 1910: 1908: 1904: 1898: 1892: 1890: 1884: 1882: 1876: 1874: 1868: 1866: 1860: 1858: 1852: 1851: 1849: 1847: 1843: 1837: 1831: 1829: 1827:(tropicbirds) 1823: 1822: 1820: 1818: 1814: 1808: 1802: 1800: 1794: 1793: 1791: 1789: 1785: 1779: 1773: 1772: 1770: 1768: 1764: 1758: 1752: 1750: 1749:Podargiformes 1747: 1745: 1742: 1740: 1734: 1733: 1731: 1729: 1725: 1719: 1713: 1711: 1705: 1703: 1699:Cuculiformes 1697: 1696: 1694: 1692: 1688: 1685: 1683: 1679: 1669: 1663: 1661: 1655: 1654: 1652: 1650: 1646: 1640: 1634: 1632: 1626: 1624: 1618: 1617: 1615: 1613: 1609: 1606: 1604: 1600: 1597: 1595: 1591: 1587: 1569: 1566: 1564: 1558: 1556: 1553: 1551: 1545: 1544: 1542: 1540: 1536: 1530: 1529: 1525: 1523: 1522: 1518: 1516: 1515: 1511: 1509: 1508: 1504: 1502: 1501: 1497: 1495: 1494: 1490: 1488: 1487: 1483: 1481: 1480: 1476: 1474: 1473: 1469: 1468: 1466: 1464: 1460: 1454: 1453: 1449: 1447: 1446: 1442: 1440: 1439: 1435: 1433: 1432: 1428: 1427: 1425: 1423: 1419: 1413: 1412: 1408: 1406: 1405: 1401: 1399: 1398: 1397:Macrocephalon 1394: 1392: 1391: 1387: 1385: 1384: 1380: 1378: 1377: 1373: 1371: 1370: 1366: 1365: 1363: 1361: 1357: 1351: 1348: 1346: 1343: 1341: 1338: 1337: 1335: 1333: 1329: 1326: 1322: 1315: 1309: 1305: 1295: 1294: 1290: 1289: 1287: 1285: 1284:Anseranatidae 1281: 1275: 1274: 1270: 1268: 1267: 1263: 1262: 1260: 1258: 1254: 1248: 1245: 1243: 1240: 1238: 1235: 1231: 1226: 1224: 1219: 1218: 1217: 1214: 1210: 1207: 1205: 1202: 1200: 1197: 1196: 1195: 1192: 1191: 1189: 1185: 1179: 1175: 1172: 1166: 1162: 1159: 1155: 1149: 1123: 1119: 1116: 1114: 1092: 1088: 1078: 1072: 1070: 1064: 1062: 1058:Tinamiformes 1056: 1054: 1048: 1046: 1040: 1039: 1037: 1035: 1034:Palaeognathae 1031: 1027: 1023: 1016: 1012: 1008: 1000: 997: 995: 992: 991: 989: 987: 984: 982: 979: 977: 974: 972: 969: 967: 964: 962: 959: 957: 954: 953: 951: 947: 941: 938: 936: 933: 931: 928: 926: 923: 921: 920:Pigeon racing 918: 916: 913: 911: 908: 906: 903: 901: 898: 896: 893: 889: 886: 885: 884: 881: 879: 876: 874: 871: 869: 866: 864: 861: 860: 858: 856: 850: 844: 841: 839: 836: 834: 831: 829: 826: 824: 821: 819: 816: 814: 811: 809: 806: 804: 801: 799: 796: 794: 791: 789: 786: 784: 781: 779: 776: 774: 771: 769: 766: 764: 763: 762:Archaeopteryx 759: 758: 756: 754: 750: 744: 741: 739: 736: 734: 731: 729: 726: 722: 719: 717: 714: 713: 712: 709: 708: 706: 704: 700: 694: 691: 689: 686: 684: 681: 679: 676: 674: 671: 669: 666: 664: 661: 659: 656: 654: 651: 649: 646: 644: 641: 639: 636: 635: 633: 631: 627: 621: 618: 616: 613: 611: 608: 606: 603: 601: 598: 596: 593: 591: 588: 584: 581: 580: 579: 576: 574: 571: 569: 566: 565: 563: 561: 557: 551: 548: 547: 544: 539: 535: 528: 523: 521: 516: 514: 509: 508: 505: 493: 490: 488: 485: 483: 480: 478: 475: 473: 470: 468: 465: 464: 461: 457: 450: 445: 443: 438: 436: 431: 430: 427: 420: 416: 412: 408: 404: 400: 396: 392: 387: 384: 380: 376: 372: 368: 364: 360: 356: 355: 348: 345: 343:0-19-858407-5 339: 334: 333: 326: 325: 321: 314: 309: 306: 303: 298: 295: 283: 276: 273: 270:, p. 219 269: 264: 261: 254: 249: 246: 244: 241: 239: 236: 235: 231: 229: 227: 223: 219: 218: 213: 209: 206:from the mid- 205: 201: 200: 195: 191: 183: 181: 179: 174: 172: 168: 164: 160: 156: 147: 142: 135: 133: 131: 127: 123: 119: 115: 111: 107: 103: 99: 95: 91: 87: 83: 77: 48: 39: 33: 19: 2141:Bird anatomy 2112: 2100: 2088: 2076: 1986:(mousebirds) 1984:Coliiformes 1854:Gaviiformes 1846:Aequornithes 1754:Apodiformes 1715:Otidiformes 1691:Otidimorphae 1638:(sandgrouse) 1560:Phasianinae 1526: 1519: 1512: 1507:Odontophorus 1505: 1498: 1491: 1484: 1477: 1470: 1450: 1443: 1436: 1429: 1409: 1402: 1395: 1388: 1381: 1374: 1367: 1345:Oreophasinae 1291: 1271: 1264: 1169:(waterfowls) 1165:Anseriformes 915:Cockfighting 900:Conservation 895:Bird feeding 883:Birdwatching 873:Ornithomancy 813:Gansuiformes 760: 753:Fossil birds 643:Intelligence 466: 394: 390: 358: 352: 331: 308: 297: 285:. Retrieved 275: 263: 215: 197: 196:, including 194:modern birds 187: 175: 151: 113: 92:edge of the 85: 82:bastard wing 81: 46: 44: 2114:WikiProject 2024:Piciformes 1907:Australaves 1886:Suliformes 1804:Gruiformes 1659:(flamingos) 1568:Tetraoninae 1539:Phasianidae 1528:Rhynchortyx 1493:Dactylortyx 1360:Megapodidae 1350:Penelopinae 1308:Galliformes 1050:Rheiformes 1044:(ostriches) 994:individuals 868:Ornithology 855:interaction 610:Preen gland 492:supercilium 243:Bird flight 161:– and thus 2130:Categories 1864:(penguins) 1717:(bustards) 1555:Perdicinae 1500:Dendrortyx 1472:Callipepla 1404:Megapodius 1369:Aepypodius 1247:Tadorninae 1229:true geese 1060:(tinamous) 1019:Neornithes 930:Pheasantry 905:Aviculture 673:Incubation 663:Lek mating 322:References 208:Cretaceous 146:bald eagle 110:diminutive 100:and a few 96:of modern 84:, (plural 1933:(parrots) 1777:(hoatzin) 1728:Strisores 1709:(turacos) 1701:(cuckoos) 1630:(mesites) 1549:(turkeys) 1521:Philortyx 1438:Agelastes 1431:Acryllium 1422:Numididae 1411:Talegalla 1321:gamebirds 1314:landfowls 1293:Anseranas 1257:Anhimidae 1216:Anserinae 999:fictional 721:dinosaurs 716:Theropoda 703:Evolution 648:Migration 630:Behaviour 255:Citations 2136:Feathers 2078:Category 1952:Afroaves 1880:(storks) 1682:Passerea 1667:(grebes) 1603:Columbea 1514:Oreortyx 1486:Cyrtonyx 1376:Alectura 1340:Cracinae 1332:Cracidae 1209:Oxyurini 1199:Aythyini 1194:Anatinae 1178:Anatidae 925:Falconry 888:big year 743:Seabirds 653:Foraging 600:Feathers 487:speculum 477:eye-ring 419:11110660 232:See also 136:Function 90:anterior 2090:Commons 1594:Neoaves 1479:Colinus 1445:Guttera 1383:Eulipoa 1204:Mergini 1068:(kiwis) 1052:(rheas) 863:Ringing 688:Hybrids 683:Nesting 638:Singing 615:Plumage 590:Dactyly 560:Anatomy 550:Outline 540:: Aves) 472:coverts 399:Bibcode 391:Science 383:4284528 363:Bibcode 226:evolved 222:species 190:extinct 122:species 2102:Portal 1978:(owls) 1452:Numida 1390:Leipoa 1273:Chauna 1266:Anhima 961:Genera 935:Imping 853:Human 693:Colony 620:Vision 605:Flight 417:  381:  354:Nature 340:  287:5 June 210:, 115 144:Adult 86:alulae 18:Alular 1222:swans 1184:ducks 1154:fowls 949:Lists 573:Brain 538:class 534:Birds 467:alula 379:S2CID 167:stall 155:slats 106:Latin 98:birds 80:, or 47:alula 595:Eggs 583:milk 578:Crop 568:Beak 415:PMID 338:ISBN 289:2015 202:(an 163:lift 94:wing 45:The 407:doi 395:290 371:doi 359:382 212:mya 114:ala 112:of 2132:: 413:, 405:, 393:, 377:, 369:, 357:, 180:. 1323:) 1316:- 1312:( 1186:) 1182:( 1156:) 1152:( 1148:e 1146:a 1144:r 1142:e 1140:s 1138:n 1136:a 1134:o 1132:l 1130:l 1128:a 1126:G 1113:e 1111:a 1109:h 1107:t 1105:a 1103:n 1101:g 1099:o 1097:e 1095:N 536:( 526:e 519:t 512:v 448:e 441:t 434:v 409:: 401:: 373:: 365:: 291:. 76:/ 73:ə 70:l 67:ʊ 64:j 61:l 58:æ 55:ˈ 52:/ 34:. 20:)

Index

Alular
Alula (disambiguation)
Drawing of the various parts of a bird's wing
/ˈæljʊlə/
anterior
wing
birds
non-avian dinosaurs
Latin
diminutive
flight feathers
species
covert feathers
flight feathers
A large bird landing on its nest
bald eagle
slats
angle of attack
lift
stall
vortex generator
peregrine falcons
extinct
modern birds
Eoalulavis hoyasi
enantiornithine
Cretaceous
mya
Protopteryx fengningensis
species

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