The Striking Behavior of Rattlesnakes Produced by and for the Hot Science – Cool Talks Outreach Lecture Series of the Environmental Science Institute.

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Presentation transcript:

The Striking Behavior of Rattlesnakes Produced by and for the Hot Science – Cool Talks Outreach Lecture Series of the Environmental Science Institute. We request that the use of any of these materials include an acknowledgement of Dr. Travis J. LaDuc, and the Hot Science – Cool Talks Outreach Lecture Series of the Environmental Science Institute of the University of Texas at Austin. We hope you find these materials educational and enjoyable. Dr. Travis J. LaDuc Hot Science - Cool Talks Volume 39

The Striking Behavior of Rattlesnakes Dr. Travis J. LaDuc Texas Memorial Museum Outreach Lecture Series

Texas Indigo Snake

Venomous snakes

Four types of venomous snakes Coral Snake Copperhead Cottonmouth Rattlesnake

Roughly 8000 people are bitten by venomous snakes in the United States each year 8-12 people die from snakebites/year What are your chances of dying from a snakebite? 16, U.S. Deaths SnakeDogLightningCar Accident Bee, Wasp, or Hornet

75% of people aged yrs 1-2% are women 40% are people playing with snake 40% are people with blood alcohol of % bites are to hands or fingers 24% bites are to feet or ankles Anatomy of a Human Snakebite  Average person bit by rattlesnake: drunk, unemployed male in 20’s free-handling pet snake at night!

Western Diamondba ck Rattlesnake

Rattlesnakes have become part of our culture

Rattlesnakes are part of our surroundings

How did I get involved with reptiles/rattlesnakes? Travis at 3 yrs old with Desert Tortoises Travis at 7 yrs old with non-venomous Gopher Snake

Recommended field guides

Photo courtesy San Diego Natural History Museum. Laurence M. Klauber

Western Diamondback Rattlesnake

Sidewinder

Rattlesnakes

Western Diamondback Rattlesnake (Crotalus atrox) rattles

Rock Rattlesnake

High-speed video footage of a Western Diamondback Rattlesnake

Western diamondba ck rattlesnake heat pits nostrils

Pit vipers Pit viper “True” viper

Newman and Hartline (1982) Diagram of a Heat Pit

Air temperature 15 o C Air temperature 30 o C Air temperature 25 o C Thermal Perception of Prey

Rattlesnakes and high temperatures

Temperature Differences

Rattlesnakes Pit Use

Thermal Perception Experiment

Physiology

Rattlesnakes eat a variety of prey

How big do rattlesnakes really get?

Transmitter & PIT Tag PIT Tag Radio Transmitter

Trans-Pecos desert in far west Texas

Blacktail rattlesnake

Tracking Rattlesnakes

Snakes with radio transmitters

Male-Male Combat

Tracking blacktail rattlesnakes

Rattlesnakes give birth to live young

Variation in Snake Size

Acceleration vs. Velocity Velocity: the rate at which an object changes its position. Would smaller or larger snakes strike with faster accelerations? Acceleration: the rate at which an object changes its velocity.

Strike of a rattlesnake

Ridgenose Rattlesnake

Pikachu

Pikachu as a scary predator

Types of venom: neurotoxic & proteolytic/hemotoxic Venom is for: –immobilizing and killing prey –in vipers: pre-ingestion digestion Medical advances with venom Venom

Steps to prevent being bitten by a snake! –Always watch where you put your hands/feet –Snakes around homes for two reasons: food and shelter Keep snake food away from house –Mice: clear brushand mouse food –Birds: remove bird feeders? Reduce openings to garage/attic – Remove excess brush

Rattlesnake Conservation

Rattlesnake Roundup

Rattlesnakes are used as entertainment

Myths to bust! Do other snakes make rattling sounds? Can venomous snakes breed with non- venomous ones? Do snakes travel in groups or in pairs? Can snakes bite underwater? Is the venom of young snakes more dangerous than that of adult snakes? Do snakes chase people?

Texas Herpetological Society 2005 Fall Symposium

Dr. Travis J. LaDuc

Acknowledgements ESI Texas Herpetological Society George S. BakkenTroy Hibbitts Brendan BorrellJason Jones Joseph E. ForksJay Kelso David W. Hall Aaron R. Krochmal John Hardison Sandra Y. LaDuc David L. Hardy, Sr. Tom Sinclair Christopher R. HarrisonBob Tipton Terry Hibbitts

Dr. Travis J. LaDuc Assistant Curator of Herpetology Texas Natural History Collections Texas Memorial Museum Dr. Travis J. LaDuc is a herpetologist at the University of Texas at Austin. His job at the University includes curation of the natural history collections as well as conducting outreach programs to a wide variety of educational and civic organizations throughout Texas. His research interests focus on the biodiversity and natural history of Texas reptiles and amphibians. Travis is also interested in all aspects of pit viper biology, including variation in venoms, population ecology, and systematics.