Countershading, or Thayer's law, is a method of camouflage in which an animal's coloration is darker on the top or upper side and lighter on the underside of the body. This pattern is found in many species of mammals, reptiles, birds, fish, and insects, both in predators and in prey. When light falls from above … See more The English zoologist Edward Bagnall Poulton, author of The Colours of Animals (1890) discovered the countershading of various insects, including the pupa or chrysalis of the purple emperor butterfly, Apatura iris, … See more Despite demonstrations and examples adduced by Cott and others, little experimental evidence for the effectiveness of countershading was gathered in the … See more Evolutionary developmental biology has assembled evidence from embryology and genetics to show how evolution has acted at all scales from the … See more • Synodontis nigriventris, an "upside-down" catfish (with reverse countershading) • Counterchanging, a heraldic device of similar appearance See more In animals Countershading is observed in a wide range of animal groups, both terrestrial, such as deer, and marine, such as sharks. It is the basis of … See more Hannah Rowland, reviewing countershading 100 years after Abbott Thayer, observed that countershading, which she defines as "darker pigmentation on those surfaces exposed to the most lighting" is a common but poorly understood aspect of See more If countershading paints out shadows, the reverse, darkening the belly and lightening the back, would maximise contrast by adding to the … See more WebAll adult penguins are countershaded: dark on the dorsal (back) surface and white on the ventral (underside) surface. The dark dorsal side blends in with the dark ocean depths when viewed from above. The light ventral side blends in with the lighter surface of the sea when viewed from below. The result is that predators or prey do not see a ...
Countershading - Wikipedia
WebDog anatomy comprises the anatomical studies of the visible parts of the body of a domestic dog.Details of structures vary tremendously from breed to breed, more than in any other animal species, wild or domesticated, as dogs are highly variable in height and weight. The smallest known adult dog was a Yorkshire Terrier that stood only 6.3 cm (2.5 in) at … WebCountershading, or Thayer's Law, is a form of camouflage.Countershading is the pattern of animal coloration in which an animal’s pigmentation is darker on the upper side and … is motor city casino open
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WebVarying hares change colors with the season: through the winter their fur is white, and as the snow disappears, their fur turns brown. Thus they remain camouflaged throughout the year. ... Many animals, particularly vertebrates, are countershaded, or shaded lighter on their lower surfaces and darker on their upper surfaces. This coloration ... WebCountershading is a form of concealing coloration in which the upper surfaces of the body are more darkly pigmented than the unilluminated lower areas, giving the body a more uniform darkness and a lack of … WebThe muskrat (Ondatra zibethicus) is a medium-sized semiaquatic rodent native to North America and an introduced species in parts of Europe, Asia, and South America. The muskrat is found in wetlands over a wide range of climates and habitats. It has important effects on the ecology of wetlands, and is a resource of food and fur for humans. Adult … is motor insurance legal cover worth having