Also: thermal imaging, pit organ, low-level laser therapy, LLLT
Infrared is felt as heat. Snakes and vampire bats "see" it, and red/near-infrared light is studied as therapy.
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Chung and colleagues reviewed low-level laser (light) therapy.
As reported in: Chung, Dai, Sharma et al. (2011). The Nuts and Bolts of Low-level Laser (Light) Therapy. Annals of Biomedical Engineering. doi:10.1007/s10439-011-0454-7
Gracheva and colleagues identified TRPA1 channels as the infrared receptors in snake pit organs, detecting radiant heating rather than light chemically.
As reported in: Gracheva, Ingolia, Kelly et al. (2010). Molecular basis of infrared detection by snakes. Nature. doi:10.1038/nature08943
Gracheva and colleagues found vampire bats detect infrared through a ganglion-specific splice form of the heat channel TRPV1.
As reported in: Gracheva, Cordero-Morales, González-Carcacía et al. (2011). Ganglion-specific splicing of TRPV1 underlies infrared sensation in vampire bats. Nature. doi:10.1038/nature10245