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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.
Crepuscular, a classification of animals that are active primarily during twilight, making them similar to nocturnal animals.; Diurnality, plant or animal behavior characterized by activity during the day and sleeping at night.
The black rat (Rattus rattus), also known as the roof rat, ship rat, or house rat, is a common long-tailed rodent of the stereotypical rat genus Rattus, in the subfamily Murinae. [1] It likely originated in the Indian subcontinent, but is now found worldwide. [2] The black rat is black to light brown in colour with a lighter underside.
The brown rat (Rattus norvegicus), also known as the common rat, street rat, sewer rat, wharf rat, Hanover rat, Norway rat and Norwegian rat, is a widespread species of common rat. One of the largest muroids, it is a brown or grey rodent with a body length of up to 28 cm (11 in) long, and a tail slightly shorter than that. It weighs between 140 ...
The big-eared climbing rat is a slender rat with two colors; dark on top of its body and light below. Its eyes and ears are large. It has large naked ears and a long naked tail with scales.
From velvety purples to fiery reds, many people can see a spectrum of vivid colors via the human eye. Others, however, may have limited hue perception due to certain conditions.
Adult bush rats are smaller than the Australian swamp rat (Rattus lutreolus) and in addition, the bush rat's foot pads are a pink colour, whereas the swamp rat's foot pads are dark brown. [5] The hair at the foot is short and pale in colour, subspecies Rattus fuscipes coracius is notably darker. [4] The feet are pentadactyl and all digits are ...
Pet rats do not pose any more of a risk of zoonotic diseases than pets such as cats or dogs. [21] Tamed rats are generally friendly and can be taught to perform selected behaviors. Selective breeding has brought about different color and marking varieties in rats. Genetic mutations have also created different fur types, such as rex and hairless.