Figure: A cat seen in infrared

An infrared photograph of an animal enhances features according to their heat emission: a cold nose appears very dark, whereas the warm eyes and ears show up brightly.

Credit: SIRTIF Science Center, taken from "The infrared revolution, unveiling the hidden universe", Monica Salomone, Lars Lindberg Christensen, Bruce Battrick, Martin Kornmesser (Hubble ESA Information Centre)

http://www.spacetelescope.org/about/further_information/brochures/html/infrared.html