Crotalus cerberus

According to Wright and Wright (1957), adults grow to an average length of {{convert|78|-|109|cm|in|abbr=on}}. Klauber (1997) reports the maximum length to be less at {{convert|1,032|mm|in|frac=8|abbr=on}}, with the smallest gravid female measuring {{convert|701|mm|in|frac=8|abbr=on}}.Klauber LM. 1997. Rattlesnakes: Their Habitats, Life Histories, and Influence on Mankind. Second Edition. 2 volumes. Reprint, University of California Press, Berkeley. {{ISBN|0-520-21056-5}}. Hubbs and O'Connor (2012) list an adult size range of {{convert|812|-|1219|mm|in|abbr=on}}.Hubbs, Brian and Brendan O'Connor. 2012. A Guide to the Rattlesnakes and other Venomous Serpents of the United States. Tricolor Books. Tempe, Arizona, 129 pp. {{ISBN|978-0-9754641-3-7}}. (Crotalus cerberus, pp. 34-35.)

The color pattern consists of a dark grayish, brownish black, reddish brown, or blackish ground color, overlaid with a dorsal pattern of blotches that are rectangular anteriorly, becoming subhexagonal posteriorly, eventually becoming crossbands just before the tail. However, specimens also may be a uniform dark color without any clear dorsal pattern, or the dorsal blotches may be even darker and bordered with white, cream, or yellow transverse rows of scales, or the color pattern may be quite pale with a significant amount of yellow mixed in. A postocular stripe is evident in lightly colored specimens, but not so much in darker ones.Campbell JA, Lamar WW. 2004. The Venomous Reptiles of the Western Hemisphere. 2 volumes. Comstock Publishing Associates, Ithaca and London. 870 pp. 1500 plates. {{ISBN|0-8014-4141-2}}.

File:Arizona_black_rattlesnake.jpg.]]

Arizona black rattlesnakes undergo morphological color change (gradual change due to changes in number or quality of chromatophores); adults are less patterned than juveniles (also called ontogenetic color change).{{cite conference |last1=Amarello |first1=Melissa |last2=Smith |first2=Jeffrey J. |title=A snake of a different color: physiological color change in Arizona black rattlesnakes |date=2009 |url=http://www.snakes.ngo/amarello_smith_2009.pdf |format=poster}} Some adults can change color relatively quickly (physiological color change: rapid change due to movement of organelles within chromatophores), an ability shared not only with chameleons and other lizards but also with other snakes such as some species in the genus Tropidophis. The mechanism for their physiological color change is likely the same as that documented in the closely related prairie rattlesnake (melanin movement within their dermal melanophores),{{cite journal |last1=Rahn |first1=Hermann |title=The pituitary regulation of melanophores in the rattlesnake |journal=The Biological Bulletin |date=1941 |volume=80 |issue=2 |pages=228–237 |doi=10.2307/1537600 |jstor=1537600 |s2cid=89145387 |url=https://www.journals.uchicago.edu/doi/abs/10.2307/1537600|url-access=subscription }} but further research is needed to determine the stimuli for this phenomenon in this rattlesnake.

Arizona black rattlesnake, black rattlesnake, black diamond rattlesnake, brown rattlesnake, Cerberus rattlesnake, mountain diamond-back. Also often incorrectly referred to as a timber rattlesnake.

Found in the United States, in Arizona from the Hualapai Mountains and Cottonwood Cliffs in the northwest of the state, southeast to the Santa Catalina, Rincon, Pinaleno and Blue Mountains. Also found at Steeple Rock, in extreme western New Mexico. The type locality given is "San Francisco Mountains" (Coconino County, Arizona, USA).

It preys upon suitably sized amphibians, reptiles, birds and their eggs, and mammals.

Sexually mature females bear live young in broods of 4 to 21 neonates. The Arizona black rattlesnake is the first species of snake observed to exhibit complex social behavior,{{cite thesis | last1 = Amarello | first1 = Melissa | year = 2012 | title = Social Snakes? Non-random association patterns detected in a population of Arizona black rattlesnakes | url = https://melissaamarello.com/wp-content/uploads/2016/12/Amarello2012MS.pdf | type = Unpublished Masters Thesis | publisher = Arizona State University | access-date = 2019-10-20 | archive-date = 2019-04-04 | archive-url = https://web.archive.org/web/20190404205508/https://melissaamarello.com/wp-content/uploads/2016/12/Amarello2012MS.pdf | url-status = dead }} and like all temperate pit vipers, care for their babies. Females remain with their young in nests for 7 to 14 days, and mothers have been observed cooperatively parenting their broods.{{cite journal | last1 = Amarello | first1 = Melissa | last2 = Smith | first2 = Jeffrey | last3 = Slone | first3 = John | year = 2011 | title = Family values: Maternal care in rattlesnakes is more than mere attendance | journal = Nature Precedings | doi = 10.1038/npre.2011.6671.1 | doi-access = free }}

{{Reflist}}

• [https://web.archive.org/web/20110126213405/http://www.nps.gov/archive/tont/nature/snakeblack.htm Arizona Black Rattlesnake, Crotalus cerberus] at the [https://www.nps.gov/index.htm National Park Service]. Accessed 18 June 2008.

{{Taxonbar|from1=Q3003829|from2=Q5188959}}

cerberus

Category:Snakes of North America

Category:Endemic reptiles of the United States

Category:Fauna of the Southwestern United States

Category:Fauna of the Sonoran Desert

Category:Natural history of Arizona

Category:Natural history of New Mexico

Category:Taxa named by Elliott Coues

Category:Reptiles described in 1875