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Unformatted text preview: 1 Predator-Prey cont. • Selection arising from rattlesnakes has favored • evolution of venom resistance • sophisticated ways of dealing with and assessing rattlesnakes behaviorally • including the elicitation and use of rattling to judge snake size and body temperature and therefore risk • skills at confronting and attacking rattlesnakes without being bitten • have knowledge of where snakes hang out and how long the hang around • Infrared signaling (Aaron Rundus) • Rattlesnakes are pit vipers • have infrared sensitive pits capable of detecting infrared radiation or “heat” at a distance • very sensitive nerve Fbers- 0.003 degrees C changes • important in predatory behavior 2 • Tested adult female California ground squirrels • Looked at the surface temperature of six regions of the squirrels head body and tail during interactions with • rattlesnake, gopher snake (a non pit viper), conspeciFc, and no stimuli Selective targeting of infrared component of tail flagging Gopher snake Rattlesnake Selective targeting of infrared component of tail flagging • But, does the infrared make a difference in the...
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- Spring '08
- Chimpanzee, Crotalinae, preys perceptual systems, Broad Survey, groups- harris hawks