Some animals have sense organs that humans do not and can thereby sense and perceive stimuli that humans cannot. Many birds and probably a variety of marine creatures can detect variations in the earth's magnetic field; some fish and invertebrates can detect electrical fields. Other animals have sense organs similar to, but more sensitive than, those of humans; they can intercept a broader range of energy or detect it at lower levels. Insects can see ultraviolet light, while pit vipers can sense infrared. Elephants can hear infrasound, and mice can hear ultrasound. The olfactory sensitivity of most animals far surpasses that of humans. Because of differences in sensory apparatus, each animal experiences a different sensory reality; this is termed each animal's Umwelt.
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