Knowledge (XXG)

Crotalus concolor

Source πŸ“

33: 46: 177: 511:, the amount of which varies in individual snakes. In rattlesnakes, venom is generally categorized into two types: Type I, which has high metalloprotease activity and lower toxicity, and Type II, characterized by high toxicity neurotoxins. Unlike some other rattlesnakes that undergo an ontogenetic shift in venom composition, 463:
Rock outcrops serve as focal points for these rattlesnake populations, providing escape cover, thermal cover, and hibernacula. These outcrops are particularly important given the short warm seasons and long, cold winters in the snake's range. The snakes often den in groups, sometimes comprising up to
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Gravid females typically move less than 20 m from their hibernaculum upon emergence. Males and non-gravid females, on the other hand, have some of the longest migrations and largest activity ranges reported for rattlesnakes. The snakes have separate winter/spring and summer activity ranges and make
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The color pattern of this species consists of a pinkish, pale brown, yellow-brown, straw-colored, reddish, or yellow-brown ground color, overlaid with a series of brown elliptical or rectangular dorsal blotches. However, most specimens are gray or silvery. In juveniles, the pattern is distinct, but
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The Faded Rattlesnake is a prey generalist that employs a sit-and-wait ambush strategy for hunting. A study done in 2007 identified 25 different prey items consumed by this species, most of which were identified through palpation or voluntary regurgitation by the snakes. The identified prey items
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Spatial trends in prey consumption have been observed, with lizards primarily consumed in rocky areas and mammals and birds consumed in sagebrush steppes where lizards are less common. However, the study did not report prey preference based on the snake's age class or any other characteristics.
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Aggregating behavior is common among Midget Faded Rattlesnakes. They often aggregate during gestation, and young snakes stay with their mother for about a week after birth. This behavior is thought to be an adaptation to environmental pressures, enhancing predator defense as well as osmo- and
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are rare, likely due to the snake's remote habitat and generally mild disposition. Symptoms of envenomation can include numbness, swelling, loss of balance, vomiting, and more. Treatment with CroFab antivenom is recommended and has been found to be effective even when administered 52 hours
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Adult individuals typically measure between 50 and 60 cm (20 to 24 inches) in length, although they can reach up to 75 cm (30 inches). This is notably shorter than the typical western rattlesnake, which can grow up to 126 cm (64 inches).The smallest gravid female measured was 52.2 cm
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is particularly potent, being 5–30 times more lethal than that of other Western Rattlesnake species. It contains a potent presynaptic phospholipase A2-based neurotoxin, known as "concolor toxin," which blocks the release of acetylcholine from nerve axon terminals, resulting in rapid prey
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After emerging from hibernation in April and May, the snakes stay near the den entrance for 2 to 3 weeks before moving to "shedding habitats," characterized by large flat rocks that assist in molting. Adult males and non-gravid females typically migrate an average of 2,122 m and 1,956 m,
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Ontogenetic shifts in prey preference have been noted, with a transition from primarily consuming lizards to mammals as the snakes grow. This shift is similar to what has been observed in other rattlesnake species, although no corresponding shift in venom composition was noted.
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Males are generally larger than females, and the snakes weigh around 120 g (4.2 oz), although they can weigh as much as 200 g (7.1 oz). Newborns of this subspecies are 50 to 100 mm (2 to 4 inches) shorter than other western rattlesnake subspecies and weigh about half as much.
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The scales are keeled, and the snake has an entire anal plate. Like all rattlesnakes, the tail ends in a horny rattle, with the number of tail rings indicating the number of molts the snake has undergone.
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does not show significant changes in venom toxicity as it matures. This phenomenon is termed "venom paedomorphosis," where the snake retains its juvenile venom characteristics into adulthood.
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becomes faded in adults, almost to the point where it is indistinguishable from the ground color. This has led to the snake sometimes being locally referred to as the "horseshoe rattler."
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The venom of the Midget Faded Rattlesnake is neurotoxic and is considered one of the most potent among Crotalid venoms. The snakes are generally non-aggressive when left undisturbed.
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G. L. Glenn, R. C. Straight (1990). "Venom characteristics as an indicator of hybridization between Crotalus viridis viridis and Crotalus scutulatus scutulatus in New Mexico".
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100 individuals. In Wyoming, where the subspecies reaches its northern limits, the distribution of suitable denning outcrops is a key factor in the snake's distribution.
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S. P. Mackessy, K. Williams, K. G. Ashton (2003). "Ontogenetic variation in venom composition and diet of Crotalus oreganus concolor: a case of venom paedomorphosis?".
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group, although apparently considerable variability exists among local populations. It is even one of the most potent venoms found in North America, and according to
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has been found to inject similar amounts of venom into both mice and lizards, despite the mass of envenomated mice being four times greater than that of the lizards.
1521: 746:. 1997. Rattlesnakes: Their Habitats, Life Histories, and Influence on Mankind. Second Edition. 2 volumes. Reprint, University of California Press, Berkeley. 593:(Viperidae), with comments on the utility of the d-loop in phylogenetic studies of snakes. Molecular Phylogenetics and Evolution, Vol. 21, No.2, pp. 176-189. 1572: 1101:
S. P. Mackessy (2010). "Evolutionary trends in venom composition in the Western Rattlesnakes (Crotalus viridis sensu lato): toxicity vs. tenderizers".
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Campbell JA, Lamar WW. 2004. The Venomous Reptiles of the Western Hemisphere. Comstock Publishing Associates, Ithaca and London. 870 pp. 1500 plates.
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McDiarmid RW, Campbell JA, TourΓ© T. 1999. Snake Species of the World: A Taxonomic and Geographic Reference, vol. 1. Herpetologists' League. 511 pp.
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L.V. Diller, R.L. Wallace (1996). "Comparative ecology of two snake species (Crotalus viridis and Pituophis melanoleucus) in southwestern Idaho".
676: 1567: 460:), and other woody plants are also present, sometimes even dominating certain areas. Juniper woodlands are more prevalent at higher altitudes. 844:
J.L. Glenn, R. Straight (1977). "The midget faded rattlesnake (Crotalus viridis concolor) venom: lethal toxicity and individual variability".
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J. M. Parker, S. H. Anderson (2007). "Ecology and behavior of the Midget Faded Rattlesnake (Crotalus oreganus concolor) in Wyoming".
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studies, the venom is many times more potent than that of an Asiatic cobra. It is characterized by the presence of a presynaptic
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S. P. Mackessy (1988). "Venom ontogeny in the Pacific Rattlesnakes Crotalus viridis helleri and Crotalus viridis oreganus".
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J.M. Macartney, P.T. Gregory (1988). "Reproductive biology of female rattlesnakes (Crotalus viridis) in British Columbia".
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immobilization. The venom also contains non-enzymatic peptide myotoxins, which further contribute to its toxicity.
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V. Bebarta, R. Dart (2003). "Effectiveness of delayed use of Crotalidae polyvalent immune fab (ovine) antivenom".
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C. L. Ownby, S. D. Aird, I. I. Kaiser (1988). "Physiological and immunological properties of small myotoxins".
903: 743: 450: 376: 211: 1342: 390: 1447: 1223: 960: 302: 150: 641:, Wright AA. 1957. Handbook of Snakes. Comstock Publishing Associates. (7th printing, 1985). 1105 pp. 1456: 1252: 1110: 853: 658:
Woodbury, A. M. (1929). "A new rattlesnake from Utah". Bulletin of the University of Utah. 20 (6): 3.
456: 638: 1513: 1161: 1004: 796: 497: 189: 40: 305:. It is a small rattlesnake known for its faded color pattern. Like all other pit vipers, it is 32: 1562: 1534: 1374: 1330: 1316: 1268: 1211: 1126: 869: 747: 700: 642: 573: 565: 486: 444: 166: 1539: 1400: 1260: 1203: 1153: 1118: 948: 899: 861: 788: 492: 396: 421:
is largely unknown. However, one observation noted the snake consuming Ord's Kangaroo Rat (
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east of long. 111Β° West (excluding the southeastern corner) and extreme west-central
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Rattlesnakes: their habits, life histories, and influence on mankind. Second edition
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shorter, more random movements primarily associated with hunting during the summer.
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This species predominantly inhabits high, cold deserts characterized by sagebrush (
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respectively, while gravid and post-partum females usually move only about 297 m.
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Ashton KG, de Queiroz A. 2001. Molecular systematics of the western rattlesnake,
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included 16 lizards, six small mammals, and three birds, such as Deer Mouse (
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A Guide to the Rattlesnakes and other Venomous Serpents of the United States
57: 1130: 1064: 1272: 1215: 448:) and an abundance of rock outcrops and exposed canyon walls. Greasewood ( 1426: 1359: 873: 372: 127: 97: 77: 999:. Eagle Mountain, Utah: Eagle Mountain Publishing, LC. pp. 207–234. 626: 1474: 1165: 952: 800: 594: 364: 87: 549:
Rattlesnakes of Arizona - Midget Faded Rattlesnake (Crotalus concolor)
427:), adding a new species to the known prey items for this rattlesnake. 379:
given is "King's Ranch, Garfield Co., at the base of the Henry Mts ."
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The ecology and behavior of the midget faded rattlesnake in Wyoming
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W. K. Hayes, S. S. Herbert, G. C. Rehling, J. F. Gennaro (2002).
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The Ecology and Behavior of Midget Faded Rattlesnakes in Wyoming
368: 1340: 1183:. Boca Raton, Florida: Taylor and Francis Group. pp. 3–23. 1333:. 1929. A new rattlesnake from Utah. Bull. Univ. Utah 20 (1). 768:. Berkeley, California, USA: University of California Press. 730:. Cheyenne, Wyoming, USA: Wyoming Game and Fish Department. 982:
The Audubon Society Field Guide to North American Mammals
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10.1670/0022-1511(2007)41[41:EABOTM]2.0.CO;2
1049:(Thesis). Laramie, Wyoming, USA: University of Wyoming. 605: 1416: 1349: 484:This species possesses the most toxic venom of the 184:Geographical range of the Midget Faded Rattlesnake 921:(Thesis). Laramie, Wyoming: University of Wyoming. 728:Amphibians and reptiles of Wyoming. Second edition 1096: 1094: 934: 932: 930: 928: 1284: 1282: 1040: 1038: 1036: 1034: 1032: 1030: 1028: 1026: 1024: 1022: 1020: 885: 883: 8: 1228:: CS1 maint: multiple names: authors list ( 1009:: CS1 maint: multiple names: authors list ( 965:: CS1 maint: multiple names: authors list ( 839: 837: 835: 833: 831: 829: 721: 719: 717: 715: 713: 695: 693: 1337: 1315:. Tricolor Books. Tempe, Arizona. 129 pp. 1311:Hubbs, Brian, and Brendan O'Connor. 2012. 1291:Journal of Toxicology: Clinical Toxicology 175: 31: 20: 1181:Handbook of Venoms and Toxins of Reptiles 430:During predatory and defensive contexts, 739: 737: 677:Integrated Taxonomic Information System 560: 558: 540: 1221: 1002: 958: 363:basins. This area covers southwestern 417:In Arizona specifically, the diet of 271:– Ashton & de Queiroz, 2001 7: 616: 614: 551:. ECO Publishing. pp. 203–204. 1573:Fauna of the Western United States 355:Found in the United States in the 14: 726:G.T. Baxter, M.D. Stone (1985). 44: 1: 1568:Reptiles of the United States 1265:10.1016/S0041-0101(09)80008-1 1123:10.1016/j.toxicon.2010.02.028 627:Reptarium.cz Reptile Database 438:Habitat and Movement Behavior 219:Crotalus confluentus concolor 1208:10.1016/0041-0101(88)90223-1 984:. New York: Alfred A. Knopf. 980:J. O. Whitaker, Jr. (1980). 866:10.1016/0041-0101(77)90031-9 629:. Accessed 11 December 2019. 608:. Accessed 3 September 2008. 208:Crotalus confluentus decolor 1589: 1418:Crotalus oreganus concolor 1325:Crotalus oreganus concolor 671:Crotalus oreganus concolor 267:Crotalus oreganus concolor 383:Diet and Feeding Behavior 258:Crotalus viridis concolor 227:Crotalus viridis concolor 195: 188: 183: 174: 156: 149: 41:Scientific classification 39: 30: 23: 287:midget faded rattlesnake 285:, commonly known as the 249:Crotalus viridis decolor 236:Crotalus viridis decolor 1179:S. P. Mackessy (2009). 526:Human envenomations by 451:Sarcobatus vermiculatus 391:Peromyscus maniculatus 222:– Woodbury, 1930 997:Biology of the Vipers 917:J. M. Parker (2003). 764:L.M. Klauber (1972). 303:western United States 301:species found in the 262:– Klauber, 1972 253:– Klauber, 1956 231:– Klauber, 1936 1061:"LD50 - intravenous" 1045:J.M. Parker (2003). 457:Juniperus scopulorum 1257:1990Txcn...28..857G 1115:2010Txcn...55.1463M 858:1977Txcn...15..129G 531:post-envenomation. 1327:, pp. 32–33.) 953:10.1643/HA03-037.1 600:2007-09-29 at the 472:thermoregulation. 295:yellow rattlesnake 1550: 1549: 1535:Open Tree of Life 1448:Crotalus concolor 1351:Crotalus concolor 1343:Taxon identifiers 1331:Woodbury, Angus M 1321:978-0-9754641-3-7 622:Crotalus concolor 507:, referred to as 445:Artemisia (plant) 432:Crotalus concolor 419:Crotalus concolor 291:faded rattlesnake 282:Crotalus concolor 278: 277: 272: 263: 254: 245: 232: 223: 215: 204: 199:Crotalus concolor 160:Crotalus concolor 25:Crotalus concolor 1580: 1543: 1542: 1530: 1529: 1517: 1516: 1504: 1503: 1491: 1490: 1478: 1477: 1465: 1464: 1452: 1451: 1450: 1437: 1436: 1435: 1409: 1408: 1396: 1395: 1383: 1382: 1370: 1369: 1368: 1338: 1299: 1298: 1286: 1277: 1276: 1240: 1234: 1233: 1227: 1219: 1191: 1185: 1184: 1176: 1170: 1169: 1141: 1135: 1134: 1109:(8): 1463–1474. 1098: 1089: 1082: 1076: 1075: 1073: 1072: 1063:. Archived from 1057: 1051: 1050: 1042: 1015: 1014: 1008: 1000: 992: 986: 985: 977: 971: 970: 964: 956: 936: 923: 922: 914: 908: 907: 887: 878: 877: 841: 824: 823: 811: 805: 804: 776: 770: 769: 761: 755: 741: 732: 731: 723: 708: 697: 688: 687: 685: 683: 665: 659: 656: 650: 636: 630: 618: 609: 591:Crotalus viridis 587: 581: 562: 553: 552: 545: 397:Neotoma albigula 351:Geographic range 335: 334: 330: 327: 270: 261: 252: 239: 230: 221: 210: 202: 179: 162: 142:C. concolor 49: 48: 35: 21: 16:Species of snake 1588: 1587: 1583: 1582: 1581: 1579: 1578: 1577: 1553: 1552: 1551: 1546: 1538: 1533: 1525: 1520: 1512: 1507: 1499: 1494: 1486: 1481: 1473: 1468: 1460: 1455: 1446: 1445: 1440: 1431: 1430: 1425: 1412: 1404: 1399: 1391: 1386: 1378: 1373: 1364: 1363: 1358: 1345: 1308: 1306:Further reading 1303: 1302: 1288: 1287: 1280: 1242: 1241: 1237: 1220: 1193: 1192: 1188: 1178: 1177: 1173: 1158:10.2307/1445927 1143: 1142: 1138: 1100: 1099: 1092: 1083: 1079: 1070: 1068: 1059: 1058: 1054: 1044: 1043: 1018: 1001: 994: 993: 989: 979: 978: 974: 957: 938: 937: 926: 916: 915: 911: 889: 888: 881: 843: 842: 827: 813: 812: 808: 793:10.2307/1445921 778: 777: 773: 763: 762: 758: 742: 735: 725: 724: 711: 698: 691: 681: 679: 667: 666: 662: 657: 653: 637: 633: 619: 612: 602:Wayback Machine 588: 584: 563: 556: 547: 546: 542: 537: 501: 482: 440: 424:Dipodomys ordii 400:), and various 385: 353: 332: 328: 325: 323: 315: 269: 260: 251: 238: 229: 201: 170: 164: 158: 145: 43: 17: 12: 11: 5: 1586: 1584: 1576: 1575: 1570: 1565: 1555: 1554: 1548: 1547: 1545: 1544: 1531: 1518: 1505: 1492: 1479: 1466: 1453: 1438: 1422: 1420: 1414: 1413: 1411: 1410: 1397: 1384: 1371: 1355: 1353: 1347: 1346: 1341: 1335: 1334: 1328: 1307: 1304: 1301: 1300: 1278: 1251:(7): 857–862. 1235: 1202:(3): 319–323. 1186: 1171: 1136: 1090: 1077: 1052: 1016: 987: 972: 947:(4): 769–782. 924: 909: 879: 852:(2): 129–133. 825: 806: 771: 756: 733: 709: 689: 660: 651: 631: 610: 582: 554: 539: 538: 536: 533: 509:concolor toxin 499: 481: 478: 439: 436: 384: 381: 352: 349: 314: 311: 276: 275: 274: 273: 264: 255: 246: 233: 224: 216: 205: 203:Woodbury, 1929 193: 192: 186: 185: 181: 180: 172: 171: 165: 154: 153: 147: 146: 139: 137: 133: 132: 125: 121: 120: 115: 111: 110: 105: 101: 100: 95: 91: 90: 85: 81: 80: 75: 71: 70: 65: 61: 60: 55: 51: 50: 37: 36: 28: 27: 15: 13: 10: 9: 6: 4: 3: 2: 1585: 1574: 1571: 1569: 1566: 1564: 1561: 1560: 1558: 1541: 1536: 1532: 1528: 1523: 1519: 1515: 1510: 1506: 1502: 1497: 1493: 1489: 1484: 1480: 1476: 1471: 1467: 1463: 1458: 1454: 1449: 1443: 1439: 1434: 1428: 1424: 1423: 1421: 1419: 1415: 1407: 1402: 1398: 1394: 1389: 1385: 1381: 1376: 1372: 1367: 1361: 1357: 1356: 1354: 1352: 1348: 1344: 1339: 1332: 1329: 1326: 1322: 1318: 1314: 1310: 1309: 1305: 1296: 1292: 1285: 1283: 1279: 1274: 1270: 1266: 1262: 1258: 1254: 1250: 1246: 1239: 1236: 1231: 1225: 1217: 1213: 1209: 1205: 1201: 1197: 1190: 1187: 1182: 1175: 1172: 1167: 1163: 1159: 1155: 1151: 1147: 1140: 1137: 1132: 1128: 1124: 1120: 1116: 1112: 1108: 1104: 1097: 1095: 1091: 1087: 1081: 1078: 1067:on 2011-07-16 1066: 1062: 1056: 1053: 1048: 1041: 1039: 1037: 1035: 1033: 1031: 1029: 1027: 1025: 1023: 1021: 1017: 1012: 1006: 998: 991: 988: 983: 976: 973: 968: 962: 954: 950: 946: 942: 935: 933: 931: 929: 925: 920: 913: 910: 905: 901: 897: 893: 886: 884: 880: 875: 871: 867: 863: 859: 855: 851: 847: 840: 838: 836: 834: 832: 830: 826: 821: 817: 816:Herpetologica 810: 807: 802: 798: 794: 790: 786: 782: 775: 772: 767: 760: 757: 753: 752:0-520-21056-5 749: 745: 740: 738: 734: 729: 722: 720: 718: 716: 714: 710: 706: 705:0-8014-4141-2 702: 696: 694: 690: 678: 674: 672: 664: 661: 655: 652: 648: 647:0-8014-0463-0 644: 640: 635: 632: 628: 624: 623: 617: 615: 611: 607: 603: 599: 596: 592: 586: 583: 579: 578:1-893777-01-4 575: 571: 570:1-893777-00-6 567: 561: 559: 555: 550: 544: 541: 534: 532: 529: 524: 521: 518:The venom of 516: 514: 510: 506: 502: 495: 494: 489: 488: 479: 477: 473: 469: 465: 461: 459: 458: 453: 452: 447: 446: 437: 435: 433: 428: 426: 425: 420: 415: 411: 407: 405: 404: 399: 398: 394:), Wood Rat ( 393: 392: 382: 380: 378: 377:type locality 374: 370: 366: 362: 358: 350: 348: 345: 341: 337: 319: 312: 310: 308: 304: 300: 296: 292: 288: 284: 283: 268: 265: 259: 256: 250: 247: 243: 237: 234: 228: 225: 220: 217: 213: 209: 206: 200: 197: 196: 194: 191: 187: 182: 178: 173: 168: 163: 161: 155: 152: 151:Binomial name 148: 144: 143: 138: 135: 134: 131: 130: 126: 123: 122: 119: 116: 113: 112: 109: 106: 103: 102: 99: 96: 93: 92: 89: 86: 83: 82: 79: 76: 73: 72: 69: 66: 63: 62: 59: 56: 53: 52: 47: 42: 38: 34: 29: 26: 22: 19: 1417: 1350: 1324: 1312: 1294: 1290: 1248: 1244: 1238: 1224:cite journal 1199: 1195: 1189: 1180: 1174: 1149: 1145: 1139: 1106: 1102: 1085: 1080: 1069:. Retrieved 1065:the original 1055: 1046: 996: 990: 981: 975: 961:cite journal 944: 940: 918: 912: 895: 891: 849: 845: 819: 815: 809: 784: 780: 774: 765: 759: 727: 680:. Retrieved 670: 663: 654: 634: 621: 590: 585: 548: 543: 527: 525: 519: 517: 512: 508: 491: 485: 483: 474: 470: 466: 462: 455: 454:), juniper ( 449: 443: 441: 431: 429: 422: 418: 416: 412: 408: 401: 395: 389: 386: 354: 346: 342: 338: 320: 316: 294: 290: 286: 281: 280: 279: 266: 257: 248: 235: 226: 218: 207: 198: 159: 157: 141: 140: 128: 24: 18: 1509:NatureServe 1483:iNaturalist 1442:Wikispecies 892:J. Herpetol 528:C. concolor 520:C. concolor 513:C. concolor 487:C. oreganus 361:Green River 336: in). 313:Description 1557:Categories 1297:: 641–753. 1152:: 92–101. 1071:2010-09-02 822:: 343–360. 744:Klauber LM 572:(series). 535:References 505:neurotoxin 493:C. viridis 403:Sceloporus 104:Suborder: 1366:Q98520179 1084:Wetstein 1005:cite book 898:: 41–51. 787:: 47–57. 682:11 August 639:Wright AH 580:(volume). 406:species. 299:pit viper 136:Species: 118:Viperidae 108:Serpentes 64:Kingdom: 58:Eukaryota 1563:Crotalus 1514:2.101404 1433:Q5188958 1427:Wikidata 1406:concolor 1360:Wikidata 1131:20227433 598:Archived 373:Colorado 357:Colorado 307:venomous 240:– 190:Synonyms 167:Woodbury 129:Crotalus 114:Family: 98:Squamata 88:Reptilia 78:Chordata 74:Phylum: 68:Animalia 54:Domain: 1475:6157444 1462:1281394 1273:2120798 1253:Bibcode 1245:Toxicon 1216:3134753 1196:Toxicon 1166:1445927 1111:Bibcode 1103:Toxicon 854:Bibcode 846:Toxicon 801:1445921 625:at the 365:Wyoming 331:⁄ 297:, is a 212:Klauber 124:Genus: 94:Order: 84:Class: 1540:181783 1501:683064 1393:209540 1319:  1271:  1214:  1164:  1146:Copeia 1129:  1088:, 1985 1086:et al. 941:Copeia 874:854933 872:  799:  781:Copeia 750:  703:  645:  576:  568:  375:. The 293:, and 244:, 1940 214:, 1930 169:, 1929 1488:30716 1380:882Q2 1162:JSTOR 797:JSTOR 480:Venom 242:Gloyd 1527:8740 1522:NCBI 1496:ITIS 1470:GBIF 1388:ITIS 1317:ISBN 1269:PMID 1230:link 1212:PMID 1150:1988 1127:PMID 1011:link 967:link 945:2003 870:PMID 785:1988 748:ISBN 701:ISBN 684:2007 643:ISBN 606:CNAH 574:ISBN 566:ISBN 369:Utah 359:and 1457:EoL 1375:CoL 1323:. 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Index


Scientific classification
Edit this classification
Eukaryota
Animalia
Chordata
Reptilia
Squamata
Serpentes
Viperidae
Crotalus
Binomial name
Woodbury

Synonyms
Klauber
Gloyd
pit viper
western United States
venomous
Colorado
Green River
Wyoming
Utah
Colorado
type locality
Peromyscus maniculatus
Neotoma albigula
Sceloporus
Dipodomys ordii

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