As this resemblance between the plumage of the bittern and its inanimate surroundings is sufficiently apparent from the accompanying Plate, it will be unnecessary to attempt any description of its colouring. It is, however, important to mention that the bird appears to be in the habit of increasing the protective power of its mottled livery, by assuming, probably under the influence of alarm, a statuesque position amid the reeds, with the body held as erect as possible, the neck stretched to its fullest extent, and the head and beak pointing skywards. In this posture it is stated, by those who have had the good fortune to see it, to be almost invisible amid the upright brown stems of reeds and bulrushes. The range of the bittern is very extensive, including the whole of temperate Europe, northern Africa, and the greater portion of Asia lying between the Himalaya and the Arctic Circle, as well as north-western India and Burma. In South Africa its place is taken by another species, a third kind inhabits Australia, New Caledonia, and New Zealand, while a fourth is a native of North and Central America, and a fifth is indigenous to tropical South America. The distribution of the group is thus almost cosmopolitan, if we except most of the tropical zone of the Old World; and all the five species are closely related. [Illustration] In Europe at the present day bitterns are still common in Spain, Holland, many parts of France and Germany, and the swamps of the Danube and Volga. It should be added that in Africa, India, and Burma the species occurs only in winter, being to some extent migratory in its habits. These shy birds associate in pairs, but in migration time collect in parties previous to setting out on their travels. The nest, which is built of reeds and flags, and lined with grass, is well concealed among the brake in which the pair have taken up their residence, and may be a floating structure. The eggs, which are from three to five in number and greenish blue in colour, are incubated solely by the hen, who is supplied with food by her mate. The chicks remain in the nest until fully fledged, and display extraordinary cleverness in making their way among the reeds. Little comes amiss to the bittern in the way of food, so long as it is of an animal nature; and its appetite is so great, that it is on the hunt for prey from sunrise till sunset. Water-rats, field-mice, birds of all kinds, fish, especially those inhabiting muddy water, snakes, lizards, leeches, worms, and insects and their larvæ are alike devoured by these voracious birds. The usual cry of the bittern is, as already mentioned, a hoarse, raven-like croak; and it is only during the breeding-season that the male utters the resounding boom, which has been compared to the bellowing of a bull, and on a still night may be heard at a distance of a mile or more. How this wonderful sound is produced is not yet definitely known.