Ground squirrels use an infrared signal to deter rattlesnake predation.

@article{Rundus2007GroundSU,
  title={Ground squirrels use an infrared signal to deter rattlesnake predation.},
  author={Aaron S Rundus and Donald H. Owings and Sanjay S. Joshi and Erin Chinn and Nicolas Giannini},
  journal={Proceedings of the National Academy of Sciences of the United States of America},
  year={2007},
  volume={104 36},
  pages={14372-6}
}
The evolution of communicative signals involves a major hurdle; signals need to effectively stimulate the sensory systems of their targets. Therefore, sensory specializations of target animals are important sources of selection on signal structure. Here we report the discovery of an animal signal that uses a previously unknown communicative modality, infrared radiation or "radiant heat," which capitalizes on the infrared sensory capabilities of the signal's target. California ground squirrels… CONTINUE READING

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