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Alectryomancy (also called alectoromancy or alectromancy; derivation comes from the Greek words ἀλεκτρυών alectryon and μαντεία manteia, which mean rooster and divination respectively) is a form of divination in which the diviner observes a bird, several birds, or most preferably a white rooster or cockerel pecking at grain (such as wheat) that the diviner has scattered on the ground. It was the responsibility of the pullularius to feed and keep the birds used. The observer may place grain in the shape of letters and thus discern a divinatory revelation by noting which letters the birds peck at, or the diviner may just interpret the pattern left by the birds' pecking in randomly scattered grain.
In another version, the observer tethers the bird in the center of a circle, around the perimeter of which is marked the alphabet, with a piece of grain at each letter. For each grain the bird pecks, the observer writes down the letter which that grain represents. The observer also replaces each grain as the bird eats it, so that letters may be repeated. The sequence of letters recorded will presumably contain a message.
This form of divination is related to Ouija, by the random selection of letters; to gyromancy, by the random selection of letters from a circle around the diviner himself; and to orniscopy, divination by the movements of birds.
Alectormancy is also sacrificing a sacred rooster. The use of the sacred rooster through alectryomancy may be further understood within that religious character and likewise defined as the cockfight or cockfighting with the intent of communication between the gods and man.
Roosters were commonly used for predictions in different parts of the world, and over the ages different methods were used. The most common and popular form of this divination based on the observation of a rooster eating corn scattered on letters. This practice was used when the sun or the moon was in Aries or Leo. A circle of letters (originally twenty-four in number, since j, v are the same as i, u) was traced on the ground and laid out with some sort of grain placed on each letter. Next a rooster, usually a white one, was let pick at the grains, thus selecting letters to create a divinatory message or sign. The chosen letters could be either read in order of selection, or rearranged to make an anagram. Sometimes readers got 2 or 3 letters and interpreted them. Additional grains replaced those taken by the rooster.
In Africa, a black hen or a gamecock is used, which within such a religious practice and belief "to foresee, to be inspired by a god" may be accurately referred to as a sacred cock or sacred vessel. An African diviner sprinkles grain on the ground and when the bird has finished eating, the seer interprets the designs or patterns left on the ground.
Another method of alectormancy, supposedly used less often, was based on reciting letters of the alphabet noting those at which a cock crows. Letters were recorded in sequence and then these letters were interpreted as the answer to the question chosen by seers.
A rare, obsolete meaning of alectormancy is "a divination by a cock-stone". A cock-stone or alectoria was "a christall coloured stone (as big as a beane) found in the gyzerne, or maw of some cockes" (Cotgrave). These stones, purportedly found in a roosters crop, were known to the Romans (in Latin they were called alectoria gemma, literally "cock's gem") and were imputed with magical powers. Apparently, they were used for some sort of lithomantic divination, though the details of this use are not to be found.
Alectormancy was also used in Ancient Rome to identify thieves.
- Encyclopaedia Perthensis; or Universal dictionary of the arts, sciences, literature, &c. intended to supersede the use of other books of reference, Volume 1 - Printed by John Brown, 1816 
- The meaning of Divination - Merriam-Webster Dictionary
Page, M. Ingpen, R. Encyclopedia of Things That Never Were. New York: Viking Studio Books 1987.