But what is this object which catches his sight? It is another Ruff--a rival. Without hesitation he rushes immediately to meet the stranger, who, nothing loath, charges in return at the top of his speed. With stretched-out beak and crest erect, the two adversaries impetuously close. A furious duel takes place, carried on in the sight of the feebler sex, who pass their opinion on the blows which are given and received, praise or blame them, and, by a cry at judicious movements, reanimate the failing ardour of the gallant combatants. Fierce blows with the beak follow one another in quick succession, blood soon flows, and the arena is reddened around them, until at last the two weary champions roll over in the dust, and lie side by side completely exhausted. During two or three months these duels are of frequent occurrence, and cannot fail to leave numerous gaps in the ranks of the species. [Illustration: Fig. 128.--Ruffs in their nuptial plumage.] In the beginning of August their rich vestments gradually disappear, and the warlike fever as rapidly abates. The Ruff now becomes a commonplace bird of peaceful habits, with no other occupation but that of searching for worms and insects on the shores of the ocean. Then is the time when they fall under the sportsman's gun and into the snares of the bird-catcher. The Ruff soon gets accustomed to living in captivity. In England, where they were formerly very numerous, and in Holland, where they are probably so still, Ruffs are reared and fattened for the table. They must, however, be kept in the dark during the breeding season, to prevent them from giving way to their turbulent tempers, which blaze out on the slightest excitement under the influence of light. These birds inhabit the northern and temperate countries of Europe and Asia: in France they are common enough on the north and north-west coast of the Channel. In spring they fix their abode in moist and marshy meadows, where they lay their eggs, four or five in number, of a greenish-grey hue, speckled with small brown spots. In the autumn they spread themselves along the sea-shore. Their size nearly equals that of the largest of the Sandpipers. The KNOT (_Tringa_, Linn.) has a bill as long as the head; the toes divided, the back toe short; the wings pointed; a shape rather heavy and thick-set. They frequent the sea-shore and salt marshes, and, except by accident, never venture far inland. They are natives of the Arctic Polar Circle, and visit our coasts in the spring and autumn. They lay their eggs, four or five in number, in their northern retreats. The Sanderlings (_Caledris_) and the Curlews (_Numenius_, Latham) are species closely allied to the Knots, but differing in their habits and physical characteristics. They visit all the coasts of Europe in small flocks, incessantly on the move. Even an abundance of food does not suffice to keep them very long in the same locality: motion seems the law of their existence.