Moist and rather elevated spots are usually preferred, and to these a certain number of combatants resort daily, each as a rule having his own peculiar place, whereon to take his stand till an enemy appears. Naumann states that until the collar of the males has attained its full beauty they are not privileged to appear in the lists. No sooner has a willing adversary come forward, than the excited couple rush upon each other, and struggle on till one or both are exhausted, when they pause and return to their former standing-places, to recover strength and breath for a second encounter. These strange battles are strictly duels, although from the fact of two or three couples engaging at the same time, and that often in such a limited space as to compel them to attack across each other, an ordinary spectator would often imagine that he was witnessing a general mêlée, instead of the entirely distinct settlement of individual wrongs and grievances. A more ridiculous sight could scarcely be imagined than the appearance of the furious combatants, as they stand ruffling and swelling out their plumage, with collar and breast feathers erect, literally trembling with rage, and darting backwards and forwards towards their adversary; rapidly ducking their wart-covered heads, and keeping the hinder part of the body much raised, as they snap and probe the enemy in a very ecstasy of blind fury. At the conclusion of the fray, the combatants again stand trembling before each other, shaking themselves, and tossing up their heads in defiance; after which demonstration, if not too much fatigued, they resume their standing-places, and again look out for a willing and equally excited foe. Owing to the soft construction of the bill, serious injuries never result from these encounters; the loss of a few feathers, or the chance of being caught and pulled about by the collar, being the worst evils to which the apparently bloodthirsty duellists are exposed. Naumann is of opinion that the knobs and excrescences often seen on the beaks of the birds are attributable to blows or twists received in these violent affrays. Occasionally a female appears and takes up her post in the fighting-ground, but never does more than indulge her curiosity, by mingling with the combatants, and watching their proceedings for a short space; after which she retires, sometimes accompanied by one of the males, who, however, almost immediately returns to the field of action, without further reference to her proceedings. When the period for depositing the eggs arrives, the males separate, each in company with two females, or _vice versâ_, and make their nest of dry grass and stubble on some high point in a marshy locality. The eggs, four, or occasionally only three, in number, are of unusual size, with a greenish or brownish shell, more or less faintly spotted with reddish brown or pale black. The mother, who alone broods and hatches her young in from seventeen to nineteen days,