Slow waters, the margins of which are thickly covered with sedge and coarse grasses, or at least with reeds and brushwood, and partially overgrown with floating herbage, afford the requisite conditions for their residence. Each family of Moor-hens seems to prefer having a whole pond to itself, and it is only on extensive pieces of water that several pairs are to be met with, and even in this case each pair strives jealously to keep possession of its own territory. There is something particularly pleasing in the appearance of these graceful and well-proportioned birds when undisturbed in their quiet pools. As they move, the points of their wings cross each other, and their tail, held perpendicularly upwards, is constantly kept moving in little jerks, their neck being bent into the shape of the letter S, and their body laying horizontally on the water. Occasionally they come on dry land to obtain a little repose, either on a tuft of weeds, or on the bough of a tree, or sometimes on a piece of floating wood. Here they employ themselves in preening and oiling their feathers, preparatory to taking another swim, or to ensconcing themselves among the rushes and thick grass. Their narrow and apparently compressed bodies enable them to make their way with facility over weeds and leaves floating upon the top of the water. Upon firm ground they move lightly and gracefully, with long and measured steps, and should they be suddenly surprised, they will rise and fly to their pond, with a flight somewhat resembling that of a Barn-door Fowl. When on the water their power of diving is extraordinary; at the slightest appearance of danger they vanish like lightning, and having plunged beneath the surface, use both wings and feet to row themselves along. Should they under these circumstances be forced to come up again to breathe, only the beak is protruded, and that under the protecting shelter of a tuft of herbage. [Illustration: THE HYACINTHINE PORPHYRIO (_Porphyrio hyacinthinus_). ONE-FOURTH NATURAL SIZE.] [Illustration: HOME OF THE MOOR-HENS (_Gallinula chloropus_).]