单词	countershading
释义	countershading /ˈkaʊntəˌʃeɪdɪŋ / noun [mass noun] Zoology Protective coloration used by some animals in which parts normally in shadow are light and those exposed to the sky are dark.We therefore report two experiments designed to test whether countershading enhances protection by diminishing the probability of detection by predators.... Because countershading is thought to aid in concealment by reducing shadow in well-lit environments, the hypothesis is partially supported despite no significant associations with other open environments. The countershading of their body is a protective camouflage. Derivatives countershaded adjective ... Comparisons across all countershaded artiodactyls similarly revealed an association with desert-dwelling. This strongly suggests that for these birds at this point in the experiment, countershaded baits really were least readily detected when placed against a color-matching substrate. It also explains why the coloration of deep-sea species is essentially uniform rather than countershaded, since bioluminescent searchlights may strike the animal from any angle.
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