Any animal emits infrared rays in the form of heat, which is its physiological and metabolic activity; this thermal energy is what the user sees when using thermal optics https://www.atncorp.com/thermal-scope-thor-hd . Similarly, users can use night vision devices for hunting and get good results. Because most organic objects around us radiate thermal energy in one way or another, most thermal sights detect differences in the heat levels of the object and the environment.
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