The sensory system of cats detects X-ray radiation with the olfactory bulb, rather than the eyes.

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“In 1965, a team of biologists at the Veterans Administration Hospital in Long Beach, California, performed experiments that seemed to show that cats could detect X rays. In conditioning experiments, cats reacted to five-second exposures of X-ray radiation in order to avoid a mild rebuff. In attempting to pinpoint the body region responsible for this remarkable feat, the researchers found that the olfactory bulb behind the nasal and oral passages was the most responsive region, rather than the eyes.” (Shuker 2001:21)

The Hidden Powers of Animals: Uncovering the Secrets of NatureMarshall Editions Ltd.January 1, 1970
Dr. Karl P. N. Shuker

Journal article
Responses of single neurons in the olfactory bulbs of rabbits, dogs, and cats to X-raysExperientia, 23: 137-138February 1, 1967
Cooper GP; Kimeldorf DJ

Book section
Olfactory mediation of immediate x-ray detectionOlfaction and Taste: Proceedings of the Third International Symposium, ed. C. Pfaffmann. pp. 288-298.January 1, 1969
Smith JC; Tucker D

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