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A probabilistic generalization of the pigeonhole principle states that if n pigeons are randomly put into m pigeonholes with uniform probability 1/m, then at least one pigeonhole will hold more than one pigeon with probability. where (m)n is the falling factorial m(m − 1) (m − 2)... (m − n + 1). For n = 0 and for n = 1 (and m > 0 ), that ...
Homing pigeon. The homing pigeon is a variety of domestic pigeon ( Columba livia domestica ), selectively bred for its ability to find its way home over extremely long distances. Because of this skill, homing pigeons were used to carry messages, a practice referred to as "pigeon post".
Pigeon keeping or pigeon fancying is the art and science of breeding domestic pigeons. People have practiced pigeon keeping for at least 5,000 years [1] and in almost every part of the world. In that time, humans have substantially altered the morphology and the behaviour of the domesticated descendants of the rock dove to suit their needs for ...
War pigeon. Homing pigeons have long played an important role in war. Due to their homing ability, speed, and altitude, they were often used as military messengers. Carrier pigeons of the Racing Homer breed were used to carry messages in World War I and World War II, and 32 such pigeons were presented with the Dickin Medal. [1]
Dovecote. A dovecote or dovecot / ˈdʌvkɒt /, doocot ( Scots) or columbarium is a structure intended to house pigeons or doves. [1] Dovecotes may be free-standing structures in a variety of shapes, or built into the end of a house or barn. They generally contain pigeonholes for the birds to nest. [2]
The kererū ( Hemiphaga novaeseelandiae) or New Zealand pigeon is a species of pigeon native to New Zealand. Johann Friedrich Gmelin described the bird in 1789 as a large, conspicuous pigeon up to 50 cm (20 in) in length and 550–850 g (19–30 oz) in weight, with a white breast and iridescent green–blue plumage.
The domestic pigeon ( Columba livia domestica or Columba livia forma domestica) [ 2] is a pigeon subspecies that was derived from the rock dove or rock pigeon. The rock pigeon is the world's oldest domesticated bird. Mesopotamian cuneiform tablets mention the domestication of pigeons more than 5,000 years ago, as do Egyptian hieroglyphics.
The testbed was the same National Bureau of Standards-developed, unpowered airframe that was later used for the US Navy's radar-guided "Bat" glide bomb, which was basically a small glider, with wings and tail surfaces, an explosive warhead section in the center, and a "guidance section" in the nose cone.