Human hair color is the pigmentation of human hair follicles and shafts due to two types of melanin: eumelanin and pheomelanin. Generally, the more melanin present, the darker the hair. Its tone depends on the ratio of black or brown eumelanin to yellow or red pheomelanin. Melanin levels can vary over time, causing a person's hair color to change, and one person can have hair follicles of more than one color. Some hair colors are associated with some ethnic groups because of the observed higher frequency of particular hair colors within their geographical region, e.g. straight, dark hair amongst East Asians, Southeast Asians, Polynesians, some Central Asians, and Native Americans; a large variety of dark, fair, curly, straight, wavy or bushy amongst Europeans, West Asians, some Central Asians, and North Africans; and curly, dark, and uniquely helical hair amongst Sub Saharan Africans. Bright red hair is found in some European populations, and hair turns gray, white, or "silver" with age.
In computing, on the X Window System, X11 color names are represented in a simple text file, which maps certain strings to RGB color values. It was traditionally shipped with every X11 installation, hence the name, and is usually located in <X11root>/lib/X11/rgb.txt. The web colors list is descended from it but differs for certain color names.
A gray horse has a coat color characterized by progressive depigmentation of the colored hairs of the coat. Most gray horses have black skin and dark eyes; unlike some equine dilution genes and some other genes that lead to depigmentation, gray does not affect skin or eye color. Gray horses may be born any base color, depending on other color genes present. White hairs begin to appear at or shortly after birth and become progressively more prevalent as the horse ages as white hairs become intermingled with hairs of other colors. Graying can occur at different rates—very quickly on one horse and very slowly on another. As adults, most gray horses eventually become completely white, though some retain intermixed light and dark hairs.
Dioryctria sylvestrella, the new pine knot-horn or maritime pine borer, is a moth of the family Pyralidae. It is found in Europe, parts of Asia and North Africa. The adult is a small mottled brown and white insect with a wingspan of 28 to 35 mm. The moth flies in a single generation from June to October and is a pest of maritime pine and several other species of pine, on which the caterpillars feed.
Variations of gray or grey include achromatic grayscale shades, which lie exactly between white and black, and nearby colors with low colorfulness. A selection of a number of these various colors is shown below.
Dioryctria zimmermani, the Zimmerman pine moth, is a moth of the family Pyralidae. It is found from southern Canada and the north-eastern and Great Lakes areas of the United States. There is a disjunct population in eastern Nebraska.
Dioryctria is a genus of snout moths. It was described by Philipp Christoph Zeller in 1846.
Dioryctria ponderosae, the ponderosa twig moth, is a moth of the family Pyralidae. The species was first described by Harrison Gray Dyar Jr. in 1914. It is found in North America from Washington and Montana south to California and northern Mexico.
Dioryctria reniculelloides, the spruce coneworm, is a moth of the family Pyralidae. The species was first described by Akira Mutuura and Eugene G. Munroe in 1973. It is found from Nova Scotia to Alaska, south in the east to New York, and south in the west to California and New Mexico. It was recorded from China in 2009. Occasionally abundant, often in conjunction with epidemics of the spruce budworm, the spruce coneworm occurs through most or all of the range of spruce in North America, feeding on new foliage and cones of spruce, and often balsam fir. When abundant, it can be a serious pest "particularly on white spruce".
Dioryctria caesirufella is a species of snout moth in the genus Dioryctria. It was described by André Blanchard and Edward C. Knudson in 1983 and is known from the US state of Texas.
Dioryctria cambiicola, the western pine moth, is a species of snout moth in the genus Dioryctria. It was described by Harrison Gray Dyar Jr. in 1914 and is found in North America from British Columbia and Alberta south to California and New Mexico.
Dioryctria cibriani is a species of snout moth in the genus Dioryctria. It was described by Akira Mutuura and Herbert H. Neunzig in 1986 and is known from Mexico.
Dioryctria contortella is a species of snout moth in the genus Dioryctria. It was described by Akira Mutuura, Eugene G. Munroe and Douglas Alexander Ross in 1969, and is known in North America from British Columbia, Alberta and Washington.
Dioryctria cuitecensis is a species of snout moth in the genus Dioryctria. It was described by Herbert H. Neunzig in 1990 and is known from Cuiteco, Mexico, from which its species epithet is derived.
Dioryctria erythropasa is a species of snout moth in the genus Dioryctria. It was described by Harrison Gray Dyar Jr. in 1914 and is found from Arizona south along the Mexican Pacific coast to Central America.
Dioryctria pinicolella is a species of snout moth in the genus Dioryctria. It was described by Hans Georg Amsel in 1962 and is known from Central America, including Mexico and Guatemala.
Dioryctria rossi is a species of snout moth in the genus Dioryctria. This moth was discovered and named by Douglas Alexander Ross, chief entomologist at the Vernon forest entomology laboratory and research centre in Vernon, British Columbia, from 1950 to 1970. It was described by Eugene G. Munroe in 1959. It is found in western North America, from southern British Columbia to northern Mexico and east to New Mexico.
Dioryctria gulosella is a species of snout moth in the genus Dioryctria. It was described by George Duryea Hulst in 1890 and is known from the United States, including Colorado, New Mexico and California.
Dioryctria mongolicella is a species of snout moth in the genus Dioryctria. It was described by Wang and Sung in 1982, and is known from north-eastern China and Mongolia.
Dioryctria sysstratiotes is a species of snout moth in the genus Dioryctria. It was described by Harrison Gray Dyar Jr. in 1919 and is known from Guatemala.
