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Crotalus molossus Baird and Girard, 1853
BLACKTAIL RATTLESNAKE
Life   Vertebrata   Reptilia   Serpentes   Viperidae   Crotalus

Crotalus molossus, Black-tailed Rattlesnake
© Copyright John Ascher, 2006-2014 · 4
Crotalus molossus, Black-tailed Rattlesnake

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Crotalus molossus, Black-tailed Rattlesnake
© Copyright John Ascher, 2006-2014 · 1
Crotalus molossus, Black-tailed Rattlesnake
Crotalus molossus, Black-tailed Rattlesnake
© Copyright John Ascher, 2006-2014 · 1
Crotalus molossus, Black-tailed Rattlesnake

Crotalus molossus, Black-tailed Rattlesnake
© Copyright John Ascher, 2006-2014 · 1
Crotalus molossus, Black-tailed Rattlesnake
Crotalus molossus
© Copyright John Ascher, 2006-2014 · 0
Crotalus molossus

Crotalus molossus
© Copyright John Ascher, 2006-2014 · 0
Crotalus molossus
Crotalus molossus, head
© JD Willson, 2006 · 0
Crotalus molossus, head

Crotalus molossus, head
© JD Willson, 2006 · 0
Crotalus molossus, head
Crotalus molossus, head
© JD Willson, 2006 · 0
Crotalus molossus, head

Crotalus molossus, side
© JD Willson, 2006 · 0
Crotalus molossus, side
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Following modified from Reptiles and Amphibians of Arizona
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Black-tailed Rattlesnake (Crotalus molossus) Arizona
Arizona

Black-tailed Rattlesnake (Crotalus molossus) Arizona
Yuma Co., AZ
Black-tailed Rattlesnake (Crotalus molossus) Arizona
Cochise Co., AZ
 

 BLACK-TAILED RATTLESNAKE   Crotalus molossus
Venomous
   

DESCRIPTION: A large (up to 1,219 mm or 48" in total length excluding rattle), brown, gray, yellow-brown, or golden yellow rattlesnake with a series of large, black or brown, blotches on the back (dorsal blotches). The blotches appear jagged-edged because each of this snakes dorsal scales is usually but a single color. A few light patches mark the interior of each dorsal blotch. The blotches are hexagonal with thin "straps" trailing down the sides to the belly. On the posterior part of the body the blotches become narrow, muted crossbands. The tail is black, sometimes with muted, dark, gray-brown rings. The top of the snout is usually black or dark brown. The pupils are vertically elliptical and the dorsal scales are keeled. The neck is slender and the head is broad and triangular. On the end of the tail is a rattle composed of a series of loosely interlocking keratinous sections. A new section is added each time the snake sheds its skin. Its uniformly dark tail distinguishes this snake from the Mohave Rattlesnake and Western Diamond-backed Rattlesnake .

DISTRIBUTION: This snake is found across nearly all of southern Arizona. It is absent from the northeastern plateau region. It occurs at elevations ranging from near sea level in the southwestern deserts to over 8,000' in the sky islands of southeastern Arizona and below the Mogollon Rim.

HABITAT:
It is found in a wide variety of biotic communities ranging from Sonoran Desertscrub to the lower reaches of Petran Subalpine Conifer Forest. It seems to be most abundant in the woodlands. It is almost always found above the flats in hilly or mountainous terrain.

BEHAVIOR: It can be active at any time of day or night when conditions are favorable. It is primarily diurnal and crepuscular in spring and fall and becomes crepuscular and nocturnal during the hot summer months. This ground-dweller is often quick to rattle at the first hint of danger and it often gives up its presence in this way. Like the other "pit-vipers" (members of the subfamily Crotalinae) this snake uses heat sensing pits (one on each side of the face between the eye and nostril) to detect warm-blooded predators and prey.

DIET:
Venom injected through long, hollow, retractable fangs is used to kill and begin digesting its prey. It feeds on mice, rats, rabbits, other small mammals, birds, and lizards.

REPRODUCTION: Mating takes place in summer and up to 16 young are born in summer.


REMARKS: This rattlesnake is capable of delivering large amounts of potent venom. If encountered it should be left alone. A large percentage of envenomations occur when a snake is handled or abused.

By Thomas C. Brennan


Bartlett. 2000. Snakes of North America: Western Region. Gulf Publishing Co. Houston, TX

Brennan, T. C., and A. T. Holycross. 2006. A Field Guide to Amphibians and Reptiles in Arizona. Arizona Game and Fish Department. Phoenix, AZ

Brennan, T. C., and A. T. Holycross. 2004 Crotalus oreganus concolor. Geographic Distribution. Herpetological Review 35(2).

Degenhardt, W. G., Painter, C. W., and Price, A. H.. 1996. Amphibians and Reptiles of New Mexico. University of New Mexico Press. Albuquerque.

Fowlie. 1965. The Snakes of Arizona. Azul Quinta Press, Fallbrook, California

Lowe, Schwalbe, Johnson. 1986. The Venomous Reptiles of Arizona. Nongame Branch Arizona Game and Fish Department. Phoenix, AZ

Stebbins. 1985. Western Reptiles and Amphibians. Houghton Mifflin. New York, NY

Black-tailed Rattlesnake (Crotalus molossus) Arizona Range Map


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All content on this website is copyrighted © 2008 Thomas C. Brennan.

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Following modified from CalPhotos
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http://calphotos.berkeley.edu/cgi/img_query?query_src=dl&where-taxon=Crotalus+molossus&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Animal ---> https://calphotos.berkeley.edu/cgi/img_query?query_src=dl&where-taxon=Crotalus+molossus&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Animal

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Number of matches : 119
Query: SELECT * FROM img WHERE ready=1 and taxon like "Crotalus molossus%" and (lifeform != "specimen_tag" OR lifeform != "Animal") ORDER BY taxon

Click on the thumbnail to see an enlargement

Crotalus molossus
Crotalus molossus
Blacktailed Rattlesnake
ID: 0000 0000 0902 0002 [detail]
© 2002 Jeff Miller

Crotalus molossus
Crotalus molossus
Black-tailed Rattlesnake
ID: 0000 0000 0902 0020 [detail]
© 2002 Jeff Miller

Crotalus molossus
Crotalus molossus
Black-tailed Rattlesnake
ID: 0000 0000 0902 0021 [detail]
© 2002 Jeff Miller

Crotalus molossus
UCMP specimen card
ID: 2222 0904 0008 0034 [detail]
© University of California Museum of Paleontology

Crotalus molossus
Crotalus molossus
Blacktailed Rattlesnake
ID: 0000 0000 1206 1217 [detail]
© 2006 Thomas Eimermacher

Crotalus molossus
Crotalus molossus
Blacktail Rattlesnake
ID: 0000 0000 0407 0069 [detail]
© 2007 Diego Ortiz

Crotalus molossus
Crotalus molossus
Blacktail Rattlesnake
ID: 0000 0000 0407 0217 [detail]
© 2007 Diego Ortiz

Crotalus molossus
Crotalus molossus
Blacktail Rattlesnake
ID: 0000 0000 0407 0216 [detail]
© 2007 Diego Ortiz

Crotalus molossus
Crotalus molossus
ID: 0000 0000 0407 2908 [detail]
© 2007 Twan Leenders

Crotalus molossus
Crotalus molossus
Black-tailed Rattlesnake
ID: 0000 0000 0707 0537 [detail]
© 2007 Diego Ortiz

Crotalus molossus
Crotalus molossus
Black-tailed Rattlesnake
ID: 0000 0000 0807 0238 [detail]
© 2008 William Flaxington

Crotalus molossus
Crotalus molossus
Blacktailed Rattlesnake
ID: 0000 0000 1007 0486 [detail]
© 2007 Thomas Eimermacher

Crotalus molossus
Crotalus molossus
Black-tailed Rattlesnake
ID: 0000 0000 0807 0237 [detail]
© 2008 William Flaxington

Crotalus molossus
Crotalus molossus
Black-tailed Rattlesnake
ID: 0000 0000 0509 2163 [detail]
© 2009 William Flaxington

Crotalus molossus
Crotalus molossus
ID: 0000 0000 0709 2334 [detail]
© 2009 Kate Jackson

Crotalus molossus
Crotalus molossus
ID: 0000 0000 0709 2341 [detail]
© 2009 Kate Jackson

Crotalus molossus
Crotalus molossus
Black-tailed Rattlesnake
ID: 0000 0000 0810 2175 [detail]
© 2010 Rob Schell

Crotalus molossus
Crotalus molossus
Black-tailed Rattlesnake
ID: 0000 0000 0810 2176 [detail]
© 2010 Rob Schell

Crotalus molossus
Crotalus molossus
Black-tailed Rattlesnake
ID: 0000 0000 0810 2177 [detail]
© 2010 Rob Schell

Crotalus molossus
Crotalus molossus
Black-tailed Rattlesnake
ID: 0000 0000 0211 1349 [detail]
© 2011 Wolfgang Wuster

Crotalus molossus
Crotalus molossus
Black-tailed Rattlesnake
ID: 0000 0000 0211 1350 [detail]
© 2011 Wolfgang Wuster

Crotalus molossus
Crotalus molossus
Black-tailed Rattlesnake
ID: 0000 0000 0211 1351 [detail]
© 2011 Wolfgang Wuster

Crotalus molossus
Crotalus molossus
Black-tailed Rattlesnake
ID: 0000 0000 0211 1353 [detail]
© 2011 Wolfgang Wuster

Crotalus molossus
Crotalus molossus
Black-tailed Rattlesnake
ID: 0000 0000 0211 1355 [detail]
© 2011 Wolfgang Wuster

Using these photos: A variety of organizations and individuals have contributed photographs to CalPhotos. Please follow the usage guidelines provided with each image. Use and copyright information, as well as other details about the photo such as the date and the location, are available by clicking on the [detail] link under the thumbnail. See also: Using the Photos in CalPhotos .   


Copyright © 1995-2018 UC Regents. All rights reserved.

CalPhotos is a project of BNHM      University of California, Berkeley

Following modified from CalPhotos
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http://calphotos.berkeley.edu/cgi/img_query?query_src=dl&where-taxon=Crotalus+molossus+oaxacus&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Animal ---> https://calphotos.berkeley.edu/cgi/img_query?query_src=dl&where-taxon=Crotalus+molossus+oaxacus&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Animal

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Number of matches : 1
Query: SELECT * FROM img WHERE ready=1 and taxon like "Crotalus molossus oaxacus%" and (lifeform != "specimen_tag" OR lifeform != "Animal") ORDER BY taxon

Click on the thumbnail to see an enlargement

Crotalus molossus oaxacus
Crotalus molossus oaxacus
Oaxacan Black-tail Rattlesnake
ID: 0000 0000 0408 1282 [detail]
© 2008 Eric Centenero-Alcalá

Using these photos: A variety of organizations and individuals have contributed photographs to CalPhotos. Please follow the usage guidelines provided with each image. Use and copyright information, as well as other details about the photo such as the date and the location, are available by clicking on the [detail] link under the thumbnail. See also: Using the Photos in CalPhotos .   


Copyright © 1995-2018 UC Regents. All rights reserved.

CalPhotos is a project of BNHM      University of California, Berkeley

Following modified from CalPhotos
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http://calphotos.berkeley.edu/cgi/img_query?query_src=dl&where-taxon=Crotalus+molossus+nigrescens&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Animal ---> https://calphotos.berkeley.edu/cgi/img_query?query_src=dl&where-taxon=Crotalus+molossus+nigrescens&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Animal

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Number of matches : 22
Query: SELECT * FROM img WHERE ready=1 and taxon like "Crotalus molossus nigrescens%" and (lifeform != "specimen_tag" OR lifeform != "Animal") ORDER BY taxon

Click on the thumbnail to see an enlargement

Crotalus molossus nigrescens
Crotalus molossus nigrescens
Mexican Black-tailed Rattlesnake
ID: 0000 0000 0408 1270 [detail]
© 2008 Eric Centenero-Alcalá

Crotalus molossus nigrescens
Crotalus molossus nigrescens
Mexican Black-tailed Rattlesnake
ID: 0000 0000 0408 1269 [detail]
© 2008 Eric Centenero-Alcalá

Crotalus molossus nigrescens
Crotalus molossus nigrescens
Mexican Black-tailed Rattlesnake
ID: 0000 0000 0408 1274 [detail]
© 2008 Eric Centenero-Alcalá

Crotalus molossus nigrescens
Crotalus molossus nigrescens
Mexican Black-tailed Rattlesnake
ID: 0000 0000 0408 1371 [detail]
© 2008 Eric Centenero-Alcalá

Crotalus molossus nigrescens
Crotalus molossus nigrescens
Mexican Black-tailed Rattlesnake
ID: 0000 0000 0408 1372 [detail]
© 2008 Eric Centenero-Alcalá

Crotalus molossus nigrescens
Crotalus molossus nigrescens
Mexican Black-tailed Rattlesnake
ID: 0000 0000 0608 2109 [detail]
© 2008 Eric Centenero-Alcalá

Crotalus molossus nigrescens
Crotalus molossus nigrescens
Mexican Black-tailed Rattlesnake
ID: 0000 0000 0608 2128 [detail]
© 2008 Eric Centenero-Alcalá

Crotalus molossus nigrescens
Crotalus molossus nigrescens
ID: 0000 0000 0211 1846 [detail]
© 2011 Timothy Burkhardt

Crotalus molossus nigrescens
Crotalus molossus nigrescens
ID: 0000 0000 0211 1847 [detail]
© 2011 Timothy Burkhardt

Crotalus molossus nigrescens
Crotalus molossus nigrescens
Mexican Black-tailed Rattlesnake
ID: 0000 0000 0112 1212 [detail]
© 2012 David Nixon

Crotalus molossus nigrescens
Crotalus molossus nigrescens
Mexican Black-tailed Rattlesnake
ID: 0000 0000 0112 1213 [detail]
© 2012 David Nixon

Crotalus molossus nigrescens
Crotalus molossus nigrescens
Mexican Black-tailed Rattlesnake
ID: 0000 0000 0112 1214 [detail]
© 2012 David Nixon

Crotalus molossus nigrescens
Crotalus molossus nigrescens
Mexican Black-tailed Rattlesnake
ID: 0000 0000 0112 1215 [detail]
© 2012 David Nixon

Crotalus molossus nigrescens
Crotalus molossus nigrescens
Mexican Black-tailed Rattlesnake
ID: 0000 0000 0112 1216 [detail]
© 2012 David Nixon

Crotalus molossus nigrescens
Crotalus molossus nigrescens
Mexican Black-tailed Rattlesnake
ID: 0000 0000 0112 1217 [detail]
© 2012 David Nixon

Crotalus molossus nigrescens
Crotalus molossus nigrescens
Mexican Black-tailed Rattlesnake
ID: 0000 0000 1113 1422 [detail]
© 2013 Ricardo Ramírez Chaparro

Crotalus molossus nigrescens
Crotalus molossus nigrescens
Mexican Black-tailed Rattlesnake
ID: 0000 0000 1113 1423 [detail]
© 2013 Ricardo Ramírez Chaparro

Crotalus molossus nigrescens
Crotalus molossus nigrescens
Mexican Black-tailed Rattlesnake
ID: 0000 0000 1113 1424 [detail]
© 2013 Ricardo Ramírez Chaparro

Crotalus molossus nigrescens
Crotalus molossus nigrescens
Mexican Black-tailed Rattlesnake
ID: 0000 0000 0217 2534 [detail]
© 2017 Ricardo Ramírez Chaparro

Crotalus molossus nigrescens
Crotalus molossus nigrescens
Mexican Black-tailed Rattlesnake
ID: 0000 0000 0317 0301 [detail]
© 2017 Ricardo Ramírez Chaparro

Crotalus molossus nigrescens
Crotalus molossus nigrescens
Mexican Black-tailed Rattlesnake
ID: 0000 0000 0317 0302 [detail]
© 2017 Ricardo Ramírez Chaparro

Crotalus molossus nigrescens
Crotalus molossus nigrescens
Mexican Black-tailed Rattlesnake
ID: 0000 0000 0317 0303 [detail]
© 2017 Ricardo Ramírez Chaparro

Using these photos: A variety of organizations and individuals have contributed photographs to CalPhotos. Please follow the usage guidelines provided with each image. Use and copyright information, as well as other details about the photo such as the date and the location, are available by clicking on the [detail] link under the thumbnail. See also: Using the Photos in CalPhotos .   


Copyright © 1995-2018 UC Regents. All rights reserved.

CalPhotos is a project of BNHM      University of California, Berkeley

Following modified from CalPhotos
   Top | See original

http://calphotos.berkeley.edu/cgi/img_query?query_src=dl&where-taxon=Crotalus+molossus+molossus&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Animal ---> https://calphotos.berkeley.edu/cgi/img_query?query_src=dl&where-taxon=Crotalus+molossus+molossus&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Animal

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Number of matches : 37
Query: SELECT * FROM img WHERE ready=1 and taxon like "Crotalus molossus molossus%" and (lifeform != "specimen_tag" OR lifeform != "Animal") ORDER BY taxon

Click on the thumbnail to see an enlargement

Crotalus molossus molossus
Crotalus molossus molossus
Northern Blacktail Rattlesnake
ID: 0000 0000 1201 0460 [detail]
© 1997 Glenn McCrea

Crotalus molossus molossus
Crotalus molossus molossus
Northern Blacktailed Rattlesnake
ID: 0000 0000 0302 0176 [detail]
© 2001 Jeff Miller

Crotalus molossus molossus
Crotalus molossus molossus
Northern Blacktail Rattlesnake
ID: 0000 0000 1201 0458 [detail]
© 1997 Glenn McCrea

Crotalus molossus molossus
Crotalus molossus molossus
Northern Blacktail Rattlesnake
ID: 0000 0000 0302 0180 [detail]
© 2001 Jeff Miller

Crotalus molossus molossus
Crotalus molossus molossus
Blacktailed Rattlesnake
ID: 0000 0000 0302 0193 [detail]
© 2001 Jeff Miller

Crotalus molossus molossus
Crotalus molossus molossus
Northern Blacktailed Rattlesnake
ID: 0000 0000 0302 0165 [detail]
© 2001 Jeff Miller

Crotalus molossus molossus
Crotalus molossus molossus
Northern Blacktail Rattlesnake
ID: 0000 0000 1201 0454 [detail]
© 1997 Glenn McCrea

Crotalus molossus molossus
Crotalus molossus molossus
Northern Blacktail Rattlesnake
ID: 0000 0000 0407 3094 [detail]
© 2007 Richard Gassaway

Crotalus molossus molossus
Crotalus molossus molossus
Northern Black-tailed Rattlesnake
ID: 0000 0000 0906 0794 [detail]
© 2006 Andreas Kettenburg

Crotalus molossus molossus
Crotalus molossus molossus
Northern Black-tailed Rattlesnake
ID: 0000 0000 0906 0795 [detail]
© 2006 Andreas Kettenburg

Crotalus molossus molossus
Crotalus molossus molossus
Blacktail Rattlesnake
ID: 0000 0000 0407 3071 [detail]
© 2007 Andreas Kettenburg

Crotalus molossus molossus
Crotalus molossus molossus
Blacktail Rattlesnake
ID: 0000 0000 0407 3073 [detail]
© 2007 Andreas Kettenburg

Crotalus molossus molossus
Crotalus molossus molossus
Blacktail Rattlesnake
ID: 0000 0000 0408 1689 [detail]
© 2008 Jeremiah Easter

Crotalus molossus molossus
Crotalus molossus molossus
Blacktail Rattlesnake
ID: 0000 0000 0807 1782 [detail]
© 2007 Andreas Kettenburg

Crotalus molossus molossus
Crotalus molossus molossus
Northern Black Tailed Rattlesnake
ID: 0000 0000 0907 0937 [detail]
© 2007 Eric Marquette

Crotalus molossus molossus
Crotalus molossus molossus
Black-tailed Rattlesnake
ID: 0000 0000 1207 0987 [detail]
© 2007 Richard Gassaway

Crotalus molossus molossus
Crotalus molossus molossus
Black-tailed Rattlesnake
ID: 0000 0000 1207 0988 [detail]
© 2007 Richard Gassaway

Crotalus molossus molossus
Crotalus molossus molossus
Black-tailed Rattlesnake
ID: 0000 0000 1207 0989 [detail]
© 2007 Richard Gassaway

Crotalus molossus molossus
Crotalus molossus molossus
Black-tailed Rattlesnake
ID: 0000 0000 1207 0990 [detail]
© 2007 Richard Gassaway

Crotalus molossus molossus
Crotalus molossus molossus
Blacktail Rattlesnake
ID: 0000 0000 0909 0832 [detail]
© 2009 Andreas Kettenburg

Crotalus molossus molossus
Crotalus molossus molossus
ID: 0000 0000 0211 1848 [detail]
© 2011 Timothy Burkhardt

Crotalus molossus molossus
Crotalus molossus molossus
Northern Blacktailed Rattlesnake
ID: 0000 0000 0302 0101 [detail]
© 1999 Glenn McCrea

Crotalus molossus molossus
Crotalus molossus molossus
Northern Blacktailed Rattlesnake
ID: 0000 0000 0302 0099 [detail]
© 1995 Glenn McCrea

Crotalus molossus molossus
Crotalus molossus molossus
Northern Blacktailed Rattlesnake
ID: 0000 0000 0302 0100 [detail]
© 1999 Glenn McCrea

Using these photos: A variety of organizations and individuals have contributed photographs to CalPhotos. Please follow the usage guidelines provided with each image. Use and copyright information, as well as other details about the photo such as the date and the location, are available by clicking on the [detail] link under the thumbnail. See also: Using the Photos in CalPhotos .   


Copyright © 1995-2018 UC Regents. All rights reserved.

CalPhotos is a project of BNHM      University of California, Berkeley

Following modified from CalPhotos
   Top | See original

http://calphotos.berkeley.edu/cgi/img_query?query_src=dl&where-taxon=Crotalus+molossus+estebanensis&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Animal ---> https://calphotos.berkeley.edu/cgi/img_query?query_src=dl&where-taxon=Crotalus+molossus+estebanensis&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Animal

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Number of matches : 1
Query: SELECT * FROM img WHERE ready=1 and taxon like "Crotalus molossus estebanensis%" and (lifeform != "specimen_tag" OR lifeform != "Animal") ORDER BY taxon

Click on the thumbnail to see an enlargement

Crotalus molossus estebanensis
Crotalus molossus estebanensis
San Esteban Rattlesnake
ID: 0000 0000 0512 2316 [detail]
© 2012 Rob Schell

Using these photos: A variety of organizations and individuals have contributed photographs to CalPhotos. Please follow the usage guidelines provided with each image. Use and copyright information, as well as other details about the photo such as the date and the location, are available by clicking on the [detail] link under the thumbnail. See also: Using the Photos in CalPhotos .   


Copyright © 1995-2018 UC Regents. All rights reserved.

CalPhotos is a project of BNHM      University of California, Berkeley

Updated: 2018-07-21 04:33:55 gmt
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