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For example, the bright yellow of an American goldfinch, the startling orange of a juvenile red-spotted newt, the deep red of a cardinal and the pink of a flamingo are all produced by carotenoid pigments synthesized by plants. In the case of the flamingo, the bird eats pink shrimps, which are themselves unable to synthesize carotenoids.
The dark blue, teal, and gold tapetum lucidum from the eye of a cow Retina of a mongrel dog with strong tapetal reflex. The tapetum lucidum (Latin for 'bright tapestry, coverlet'; / t ə ˈ p iː t əm ˈ l uː s ɪ d əm / tə-PEE-təm LOO-sih-dəm; pl.: tapeta lucida) [1] is a layer of tissue in the eye of many vertebrates and some other animals.
The first person to breed for the Hereford color pattern in pigs – and the first to describe it – was R.U. Weber of LaPlata, Missouri. [4]: 611 From about 1902 until 1925 a number of farmers in Nebraska and Iowa, among them John Schulte of Norway, Iowa, collaborated in the selection of pigs with this coloration.
The adult length ranges from 100 to 140 cm (39 to 55 in), and heights of about 50 to 65 cm (20 to 26 in) are common. [11] The curled adult tail is about 24 to 30 cm (9.4 to 12 in). These pigs have characteristically long necks and legs, deep sides, and narrow backs. Their ham structures are quite muscular and firm.
The tapetum lucidum, in animals that have it, can produce eyeshine, for example as seen in cat eyes at night. Red-eye effect, a reflection of red blood vessels, appears in the eyes of humans and other animals that have no tapetum lucidum, hence no eyeshine, and rarely in animals that have a tapetum lucidum. The red-eye effect is a photographic ...
Because of the pigment restriction caused by the temperature sensitive tyrosinase, pointed cats' eyes are always shades of blue because the blue layer in the eye common to all cats is not covered by another color. The back of the eye also lacks pigment, giving colorpoint cats' pupils a red and silver reflection in the dark, unlike a normally ...
Red river hog at Durrell Wildlife Park . Red river hogs are often active during the day, but are primarily nocturnal or crepuscular. [5] They typically live in small groups of approximately six to ten animals, composed of a single adult male, and a number of adult females and their young. [3]
Today, most mammals possess dichromatic vision, corresponding to protanopia red–green color blindness. They can thus see violet, blue, green and yellow light, but cannot see ultraviolet or deep red light. [5] [6] This was probably a feature of the first mammalian ancestors, which were likely small, nocturnal, and burrowing.