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Specimens over 150 cm (5 ft) are infrequently encountered, while those over 180 cm (6 ft) are very rare, and the largest reported length considered to be reliable is 213 cm (7 ft). [6] Males become much larger than females, although this difference in size does not occur until after they have reached sexual maturity. [5]
The rattlesnake genus Crotalus, which includes the aforementioned eastern diamondback rattlesnake and western diamondback rattlesnake (Crotalus atrox), reaches a maximum length of 2.13 m (7 ft 0 in), and according to W. A. King one large specimen had a length of 2.26 m (7 ft 5 in) and a mass of 11 kg (24 lb). [87]
The size of this species varies greatly, with some populations being stunted and others growing very large. Mainland specimens often reach 100 cm (39 in) in length, with the largest on record being 162.6 cm (64.0 in) (Klauber, 1956) [6] for C. o. oreganus. [7] This species, in its various forms, shows considerable ontogenetic variation ...
English: Western Diamondback Rattlesnake (Crotalus atrox), Municipality of Padilla, Tamaulipas, Mexico. Photographed on highway at night on 29 May 2004 by William L. Farr. This image was originally photographed with film and later scanned from a print.
Eastern diamondback rattlesnake at the Saint Louis Zoo Detail of rattle. The eastern diamondback rattlesnake is the largest rattlesnake species and is one of the heaviest known species of venomous snake, with one specimen shot in 1946 measuring 2.4 m (7.8 ft) in length and weighing 15.4 kg (34 lb).
The maximum recorded size is 151.5 cm (4.97 ft). In Montana, specimens occasionally exceed 120 centimetres (3.9 ft) in length; the species reaches its maximum size in this region. One of the most characteristic features is the presence of three or more, usually four, internasal scales .
This moderately large species commonly exceeds 100 cm (39 in) on the mainland. Large males may exceed 140 cm (55 in), although specimens of over 150 cm (59 in) are quite rare. The largest specimen on record measured 162 cm (64 in) (Klauber, 1937). [5]
The diamondback terrapin has large webbed feet. [10] The species is sexually dimorphic in that the males grow to a carapace length of approximately 13 cm (5 in), while the females grow to an average carapace length of around 19 cm (7 + 1 ⁄ 2 in), though they are capable of growing larger. The largest female on record was just over 23 cm (9 in ...