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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.
Diurnality, plant or animal behavior characterized by activity during the day and sleeping at night. Cathemeral, a classification of organisms with sporadic and random intervals of activity during the day or night. Matutinal, a classification of organisms that are only or primarily active in the pre-dawn hours or early night.
Oude Rode Ogen ("Old Red Eyes") or the "Beast of Flanders" was a spirit reported in Mechelen, Belgium in the 18th century who would take the form of a large black dog with fiery red eyes. In Wallonia , the southern region of Belgium, folktales mentioned the Tchén al tchinne ("Chained Hound" in Walloon ), a hellish dog bound with a long chain ...
A nocturnal house, sometimes called a nocturama, [1] is a building in a zoo or research establishment where nocturnal animals are kept and viewable by the public. The unique feature of buildings of this type is that the lighting within is isolated from the outside and reversed; i.e. it is dark during the day and lit at night .
'Twas the Night Before Christmas History The poem, originally titled A Visit or A Visit From St. Nicholas , was first published anonymously on Dec. 23, 1823, in a Troy, New York newspaper called ...
This duplication has allowed trichromacy for both sexes; its X chromosome gained two loci to house both the green allele and the red allele. The recurrence and spread of routine trichromacy in howler monkeys suggests that it provides them with an evolutionary advantage. Howler monkeys are perhaps the most folivorous of the New World monkeys.
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The eyes have yellow irises and elliptical pupils; white lines can be seen around the eye. Dark lines run from the corner of the eyes down the sides of the nose and a dark patch marks the nose. [37] [38] [40] The skull is fairly broad in the region of the zygomatic arch; hence the head of this cat appears relatively rounder. [27]