T-SERVICE / SCIENCE PHOTO LIBRARY T-SERVICE / SCIENCE PHOTO LIBRARY
Grey wolf. Thermogram of a grey wolf (Canis lupus). A thermogram shows variation in temperature on the surface of an object, measured by the long-wave infrared radiation it emits. The temperature scale is colour-coded and runs from purple (-2 degrees Celsius, coldest) through blue, green and yellow to red (warmest, 28 degrees Celsius.).
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