Troglobites are small creatures that have adapted to life in a cave. To survive in the darkness, troglobites have evolved exceptional senses of smell, hearing and touch, but often lack sight and skin pigmentation. Photo credit: Ryan Hagerty, USFWS
(Of electromagnetic radiation) having a wavelength just greater than that of the red end of the visible light spectrum. Infrared radiation has a wavelength from about 800 nm to 1 mm, and is emitted particularly by heated objects.