Greyhound

The Greyhound is a very old breed of dog, a sighthound which has been historically bred for coursing game and latterly Greyhound racing. Since the rise in large scale adoption of retired racing Greyhounds, particularly in North America from the end of the 20th century, it has seen a resurgence in popularity as a family pet.

According to Merriam-Webster, a Greyhound is "any of a breed of tall slender graceful smooth-coated dogs characterized by swiftness and keen sight...of several related dogs."

It is a gentle and intelligent breed whose combination of long, powerful legs, deep chest, flexible spine and slim build allows it to reach average race speeds in excess of 64 kilometres per hour (40 mph). The Greyhound can reach a full speed of 70 kilometres per hour (43 mph) within 30 metres or six strides from the boxes, traveling at almost 20 metres per second for the first 250 metres of a race. There are a few mammals that can accelerate faster over a short distance, such as the cheetah, which can reach speeds of 109 kilometres per hour (68 mph) over 3-4 strides from a standing start, and pronghorn with an alleged top speed of 93 kilometres per hour (58 mph)

Pond

A pond is a body of standing water, either natural or artificial, that is usually smaller than a lake. They may arise naturally in floodplains as part of a river system, or they may be somewhat isolated depressions (examples include vernal pools and prairie potholes). Usually they contain shallow water with marsh and aquatic plants and animals. A few animals also make their home in ponds, including both alligators and beavers. The type of life in a pond is generally determined by a combination of factors including water level regime (particularly depth and duration of flooding) and nutrient levels, but other factors may also be important, including presence or absence of shading by trees, presence or absence of streams, effects of grazing animals, and salinity.

Ponds are frequently human-constructed. In country side farmers and villagers dig a pond in their backyard or increase the depth of an existing pond by removing layers of mud during summer season. A wide variety of artificial bodies of water are classified as ponds. Some ponds are created specifically for habitat restoration, including water treatment. Others, like water gardens, water features and koi ponds are designed for aesthetic ornamentation as landscape or architectural features. Fish ponds are designed for commercial fish breeding, and solar ponds designed to store thermal energy.