dog wiki:
all>Conservation status: Domesticated The dog is a canine mammal of the Order Carnivora that has been domesticated for at least 24,800 years and perhaps for as long as 150,000 years based on recent evidence. In this time, the dog has been developed into hundreds of breeds with a great degree of variation. For example, heights range from just a few inches (such as the Chihuahua) to nearly three feet (such as the Irish Wolfhound), and colors range from white to black with reds, grays, and browns also occurring in a tremendous variation of patterns. Dogs, like humans, are highly social animals and pack hunters; this similarity in their overall behavioral design accounts for their trainability, playfulness, and ability to fit into human households and social situations. Dogs fill a variety of roles in human society and are often trained as working dogs. For dogs that do not have traditional jobs, a wide range of dog sports provide the opportunity to exhibit their natural skills. In many countries, the most common and perhaps most important role of dogs is as companions. Dogs have lived with and worked with humans in so many roles that their loyalty has earned them the sobriquet "mans best friend." Conversely, some cultures consider dogs to be unclean.
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shadow wiki:
>This article is about the optical phenomenon; for other meanings, see Shadow (disambiguation). A shadow is a region of darkness where light is blocked. A shadow occupies all the space behind an opaque object with light in front of it. The cross-section of a shadow is a two-dimensional silhouette, or reverse projection of the object blocking the light.
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wall wiki:
l is a usually solid structure that defines and sometimes protects space. Most commonly, a wall separates space in buildings into rooms, or protects or delineates a space in the open air. There are three principal types of structural walls: building walls, exterior boundary walls, and retaining walls.
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