1053:
220:
725:
238:
1420:
1045:
1408:
318:
The IUCN recommends that care be taken to avoid classing species as "data deficient" when the absence of records may indicate dangerously low abundance: "If the range of a taxon is suspected to be relatively circumscribed, if a considerable period of time has elapsed since the last record of the
1330:
1345:
1067:
299:
to be made. This does not necessarily indicate that the species has not been extensively studied, but it usually indicates that little or no information is available on the
1108:
953:
1302:
997:
746:
688:
85:
1287:
741:
1221:
1335:
1282:
797:
357:
342:
1236:
792:
761:
703:
537:
292:
191:
132:
1455:
1340:
1246:
787:
771:
713:
262:
168:
766:
708:
511:
142:
1325:
307:
of the species. It can also indicate uncertainty about the taxonomic classification of an organism; for example, the IUCN classifies the
1320:
990:
875:
870:
1277:
1173:
756:
751:
698:
693:
683:
105:
95:
60:
865:
472:
219:
1292:
1241:
1077:
736:
1450:
1366:
1251:
983:
529:
1376:
1087:
861:
372:
332:
1231:
1381:
1371:
1029:
347:
337:
255:
1178:
841:
678:
504:
209:
91:
50:
1440:
1193:
1082:
392:
382:
231:
204:
1168:
629:
377:
367:
138:
1361:
933:
836:
828:
387:
362:
1267:
1129:
928:
352:
248:
1052:
846:
1272:
1226:
1163:
497:
237:
1398:
832:
312:
1145:
857:
1297:
1188:
893:
436:
853:
611:
320:
128:
1445:
1198:
1183:
1124:
943:
304:
824:
616:
585:
148:
81:
903:
885:
8:
1103:
938:
923:
567:
300:
296:
288:
56:
22:
225:
27:
1006:
595:
590:
577:
520:
101:
70:
1034:
918:
413:
898:
431:
1044:
728:
1424:
1412:
975:
1434:
651:
540:
422:
199:
174:
948:
1024:
622:
562:
295:(IUCN) as offering insufficient information for a proper assessment of
116:
46:
35:
489:
1419:
284:
1346:
List of threatened reptiles and amphibians of the United States
1010:
913:
311:
as "data deficient" because of the likelihood that two or more
1072:
1068:
Environment
Protection and Biodiversity Conservation Act 1999
908:
816:
308:
319:
taxon, threatened status may well be justified" (see also
1109:
Committee on the Status of
Endangered Wildlife in Canada
1396:
412:Reeves, R.; Pitman, R. L.; Ford, J. K. B. (2017).
1331:Endangered mammals and birds of the United States
1222:List of endangered and protected species of China
1432:
1005:
411:
1336:List of threatened mammals of the United States
964:Pre-2001 categories and subcategories shown in
358:IUCN Red List data deficient species (Cnidaria)
343:IUCN Red List data deficient species (Annelida)
1237:List of endemic and threatened plants of India
473:"2001 Categories & Criteria (version 3.1)"
437:10.2305/IUCN.UK.2017-3.RLTS.T15421A50368125.en
293:International Union for Conservation of Nature
1341:List of threatened birds of the United States
1247:List of threatened species of the Philippines
991:
505:
256:
1326:List of endangered animals of North America
530:Template: Threatened species by region
1321:List of endangered plants of North America
998:
984:
512:
498:
263:
249:
1174:Endangered Species Act Amendments of 1978
435:
876:The world's 100 most threatened species
871:The World's 25 Most Endangered Primates
1433:
1242:List of endangered species in Pakistan
1078:Threatened Species Protection Act 1995
519:
1367:List of threatened flora of Australia
1252:List of endangered species in Vietnam
979:
493:
1456:IUCN Red List data deficient species
1377:List of threatened mammals of Brazil
1088:Trade in Endangered Species Act 1989
470:
373:List of data deficient invertebrates
333:IUCN Red List data deficient species
1232:List of endangered animals in India
423:IUCN Red List of Threatened Species
13:
1382:List of threatened birds of Brazil
1372:List of endangered flora of Brazil
16:IUCN species-conservation category
14:
1467:
1030:Environmental Vulnerability Index
464:
457:"The Categories", in IUCN (1983).
348:List of data deficient arthropods
338:List of data deficient amphibians
1418:
1406:
1179:Endangered species recovery plan
1051:
1043:
954:Vulnerability and susceptibility
842:Decline in amphibian populations
724:
723:
236:
218:
210:Lists of organisms by population
1194:NatureServe conservation status
1083:Threatened ecological community
393:List of data deficient reptiles
383:List of data deficient molluscs
1169:Endangered Species Act of 1973
630:Conservation Dependent (LR/cd)
451:
405:
378:List of data deficient mammals
368:List of data deficient insects
1:
1362:Threatened fauna of Australia
934:Ecoregion conservation status
837:Decline in insect populations
398:
388:List of data deficient plants
363:List of data deficient fishes
194:Conservation of Nature (IUCN)
1451:Biota by conservation status
1268:Threatened mammals of Europe
1130:Funds for Endangered Parrots
929:Conservation-reliant species
353:List of data deficient birds
7:
1273:Endangered plants of Europe
1227:Endangered mammals of India
1164:Distinct population segment
326:
139:Conservation Dependent (CD)
10:
1472:
586:Critically Endangered (CR)
82:Critically Endangered (CR)
1354:
1311:
1260:
1214:
1207:
1154:
1146:Endangered Wildlife Trust
1138:
1117:
1096:
1060:
1041:
1017:
962:
884:
814:
780:
722:
671:
664:
639:
604:
576:
555:
548:
536:
527:
1189:National Wildlife Refuge
894:Biodiversity action plan
568:Extinct in the Wild (EW)
57:Extinct in the Wild (EW)
321:precautionary principle
192:International Union for
1441:Data deficient species
1199:The Nature Conservancy
1184:Endangered Wolf Center
1125:EAZA Ex-situ Programme
944:Latent extinction risk
315:are separate species.
287:is one which has been
28:IUCN Red List category
829:Endangered arthropods
825:Threatened arthropods
747:Critically Endangered
689:Critically Endangered
430:: e.T15421A50368125.
904:Conservation biology
899:Biodiversity threats
612:Near Threatened (NT)
129:Near Threatened (NT)
1104:Species at Risk Act
939:Habitat destruction
924:Conservation status
742:Extinct in the Wild
684:Extinct in the Wild
647:Data Deficient (DD)
297:conservation status
165:Data Deficient (DD)
23:Conservation status
1007:Threatened species
652:Not Evaluated (NE)
640:Not fully assessed
617:Least Concern (LC)
521:Threatened species
477:2014 IUCN Red List
313:types of the whale
232:NatureServe status
205:NatureServe status
175:Not Evaluated (NE)
149:Least Concern (LC)
1394:
1393:
1390:
1389:
1035:Regional Red List
973:
972:
919:Bird conservation
810:
809:
806:
805:
660:
659:
273:
272:
1463:
1423:
1422:
1411:
1410:
1409:
1402:
1212:
1211:
1055:
1047:
1000:
993:
986:
977:
976:
727:
726:
669:
668:
553:
552:
546:
545:
514:
507:
500:
491:
490:
486:
484:
483:
458:
455:
449:
448:
446:
444:
439:
409:
265:
258:
251:
240:
226:Red List classes
222:
157:Other categories
119:
73:
38:
19:
18:
1471:
1470:
1466:
1465:
1464:
1462:
1461:
1460:
1431:
1430:
1429:
1417:
1407:
1405:
1397:
1395:
1386:
1350:
1313:
1307:
1256:
1203:
1156:
1150:
1134:
1113:
1092:
1056:
1050:
1049:
1048:
1039:
1013:
1004:
974:
969:
958:
880:
802:
776:
762:Near Threatened
718:
704:Near Threatened
656:
635:
623:Lower Risk (LR)
600:
596:Vulnerable (VU)
591:Endangered (EN)
572:
532:
523:
518:
481:
479:
467:
462:
461:
456:
452:
442:
440:
410:
406:
401:
329:
269:
235:
229:
223:
196:
193:
117:
102:Vulnerable (VU)
92:Endangered (EN)
71:
36:
30:
17:
12:
11:
5:
1469:
1459:
1458:
1453:
1448:
1443:
1428:
1427:
1415:
1392:
1391:
1388:
1387:
1385:
1384:
1379:
1374:
1369:
1364:
1358:
1356:
1352:
1351:
1349:
1348:
1343:
1338:
1333:
1328:
1323:
1317:
1315:
1309:
1308:
1306:
1305:
1303:United Kingdom
1300:
1295:
1290:
1285:
1280:
1275:
1270:
1264:
1262:
1258:
1257:
1255:
1254:
1249:
1244:
1239:
1234:
1229:
1224:
1218:
1216:
1209:
1205:
1204:
1202:
1201:
1196:
1191:
1186:
1181:
1176:
1171:
1166:
1160:
1158:
1152:
1151:
1149:
1148:
1142:
1140:
1136:
1135:
1133:
1132:
1127:
1121:
1119:
1115:
1114:
1112:
1111:
1106:
1100:
1098:
1094:
1093:
1091:
1090:
1085:
1080:
1075:
1070:
1064:
1062:
1058:
1057:
1042:
1040:
1038:
1037:
1032:
1027:
1021:
1019:
1015:
1014:
1003:
1002:
995:
988:
980:
971:
970:
963:
960:
959:
957:
956:
951:
946:
941:
936:
931:
926:
921:
916:
911:
906:
901:
896:
890:
888:
882:
881:
879:
878:
873:
868:
844:
839:
821:
819:
812:
811:
808:
807:
804:
803:
801:
800:
795:
790:
784:
782:
778:
777:
775:
774:
772:Data Deficient
769:
764:
759:
754:
749:
744:
739:
733:
731:
720:
719:
717:
716:
714:Data Deficient
711:
706:
701:
696:
691:
686:
681:
675:
673:
666:
662:
661:
658:
657:
655:
654:
649:
643:
641:
637:
636:
634:
633:
626:
619:
614:
608:
606:
602:
601:
599:
598:
593:
588:
582:
580:
574:
573:
571:
570:
565:
559:
557:
550:
543:
534:
533:
528:
525:
524:
517:
516:
509:
502:
494:
488:
487:
466:
465:External links
463:
460:
459:
450:
403:
402:
400:
397:
396:
395:
390:
385:
380:
375:
370:
365:
360:
355:
350:
345:
340:
335:
328:
325:
277:data deficient
271:
270:
268:
267:
260:
253:
245:
242:
241:
224:Comparison of
215:
214:
213:
212:
207:
202:
197:
190:
185:
184:
183:Related topics
180:
179:
178:
177:
172:
159:
158:
154:
153:
152:
151:
146:
136:
123:
122:
112:
111:
110:
109:
99:
89:
76:
75:
67:
66:
65:
64:
54:
41:
40:
32:
31:
25:
15:
9:
6:
4:
3:
2:
1468:
1457:
1454:
1452:
1449:
1447:
1446:IUCN Red List
1444:
1442:
1439:
1438:
1436:
1426:
1421:
1416:
1414:
1404:
1403:
1400:
1383:
1380:
1378:
1375:
1373:
1370:
1368:
1365:
1363:
1360:
1359:
1357:
1353:
1347:
1344:
1342:
1339:
1337:
1334:
1332:
1329:
1327:
1324:
1322:
1319:
1318:
1316:
1310:
1304:
1301:
1299:
1296:
1294:
1291:
1289:
1286:
1284:
1281:
1279:
1276:
1274:
1271:
1269:
1266:
1265:
1263:
1259:
1253:
1250:
1248:
1245:
1243:
1240:
1238:
1235:
1233:
1230:
1228:
1225:
1223:
1220:
1219:
1217:
1213:
1210:
1206:
1200:
1197:
1195:
1192:
1190:
1187:
1185:
1182:
1180:
1177:
1175:
1172:
1170:
1167:
1165:
1162:
1161:
1159:
1153:
1147:
1144:
1143:
1141:
1137:
1131:
1128:
1126:
1123:
1122:
1120:
1116:
1110:
1107:
1105:
1102:
1101:
1099:
1095:
1089:
1086:
1084:
1081:
1079:
1076:
1074:
1071:
1069:
1066:
1065:
1063:
1059:
1054:
1046:
1036:
1033:
1031:
1028:
1026:
1023:
1022:
1020:
1016:
1012:
1008:
1001:
996:
994:
989:
987:
982:
981:
978:
967:
961:
955:
952:
950:
947:
945:
942:
940:
937:
935:
932:
930:
927:
925:
922:
920:
917:
915:
912:
910:
907:
905:
902:
900:
897:
895:
892:
891:
889:
887:
883:
877:
874:
872:
869:
867:
863:
859:
855:
851:
850:
845:
843:
840:
838:
835: /
834:
830:
826:
823:
822:
820:
818:
813:
799:
796:
794:
791:
789:
786:
785:
783:
779:
773:
770:
768:
767:Least Concern
765:
763:
760:
758:
755:
753:
750:
748:
745:
743:
740:
738:
735:
734:
732:
730:
729:WP categories
721:
715:
712:
710:
709:Least Concern
707:
705:
702:
700:
697:
695:
692:
690:
687:
685:
682:
680:
677:
676:
674:
670:
667:
663:
653:
650:
648:
645:
644:
642:
638:
632:
631:
627:
625:
624:
620:
618:
615:
613:
610:
609:
607:
603:
597:
594:
592:
589:
587:
584:
583:
581:
579:
575:
569:
566:
564:
561:
560:
558:
554:
551:
547:
544:
542:
539:
535:
531:
526:
522:
515:
510:
508:
503:
501:
496:
495:
492:
478:
474:
471:IUCN (2001).
469:
468:
454:
438:
433:
429:
425:
424:
419:
417:
408:
404:
394:
391:
389:
386:
384:
381:
379:
376:
374:
371:
369:
366:
364:
361:
359:
356:
354:
351:
349:
346:
344:
341:
339:
336:
334:
331:
330:
324:
322:
316:
314:
310:
306:
302:
298:
294:
290:
286:
282:
278:
266:
261:
259:
254:
252:
247:
246:
244:
243:
239:
233:
227:
221:
217:
216:
211:
208:
206:
203:
201:
200:IUCN Red List
198:
195:
189:
188:
187:
186:
182:
181:
176:
173:
170:
166:
163:
162:
161:
160:
156:
155:
150:
147:
144:
140:
137:
134:
130:
127:
126:
125:
124:
121:
120:
114:
113:
107:
103:
100:
97:
93:
90:
87:
83:
80:
79:
78:
77:
74:
69:
68:
62:
58:
55:
52:
48:
45:
44:
43:
42:
39:
34:
33:
29:
24:
21:
20:
1139:South Africa
965:
949:Rare species
886:Conservation
864: /
860: /
856: /
852: /
848:
831: /
827: /
798:Appendix III
646:
628:
621:
563:Extinct (EX)
480:. Retrieved
476:
453:
441:. Retrieved
427:
421:
416:Orcinus orca
415:
407:
317:
305:distribution
280:
276:
274:
164:
115:
47:Extinct (EX)
1061:Australasia
1025:Blue-listed
847:Threatened
793:Appendix II
443:19 November
289:categorized
1435:Categories
788:Appendix I
757:Vulnerable
752:Endangered
699:Vulnerable
694:Endangered
605:Lower risk
578:Threatened
549:Categories
482:2014-08-26
399:References
118:Lower Risk
72:Threatened
1355:Elsewhere
1288:Lithuania
1018:By region
866:Chromista
301:abundance
1278:Bulgaria
541:Red List
327:See also
1425:Biology
1413:Ecology
1399:Portals
1314:America
1298:Ukraine
966:italics
849:Banksia
833:spiders
737:Extinct
679:Extinct
665:Species
556:Extinct
291:by the
285:species
37:Extinct
1312:North
1293:Russia
1261:Europe
1157:States
1155:United
1118:Europe
1097:Canada
1011:region
914:ARKive
858:sharks
1283:Italy
1208:Lists
1073:ROTAP
909:CITES
862:Fungi
781:CITES
672:Lists
234:below
228:above
1215:Asia
854:rays
817:taxa
538:IUCN
445:2021
428:2017
309:orca
303:and
230:and
169:list
143:list
133:list
106:list
96:list
86:list
61:list
51:list
1009:by
815:By
432:doi
323:).
26:by
1437::
475:.
426:.
420:.
283:)
281:DD
275:A
1401::
999:e
992:t
985:v
968:.
513:e
506:t
499:v
485:.
447:.
434::
418:"
414:"
279:(
264:e
257:t
250:v
171:)
167:(
145:)
141:(
135:)
131:(
108:)
104:(
98:)
94:(
88:)
84:(
63:)
59:(
53:)
49:(
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
