Amongst the feathered notables from all parts of the world found gathered at the Zoological Gardens in London is the Crested Screamer from South America. It is in many respects a very singular species, and its large size, great strength, and majestic demeanour, with the surprising docility and intelligence it displays when domesticated, give it a character amongst birds somewhat like that of the elephant amongst mammals. Briefly and roughly to describe it: in size it is like a swan, in shape like a lapwing, only with a powerful curved gallinaceous beak. It is adorned with a long pointed crest and a black neck-ring, the plumage being otherwise of a pale slaty blue, while the legs and the naked skin about the eyes are bright red. On each wing, in both sexes, there are two formidable spurs; the first one, on the second joint, is an inch and a half long, nearly straight, triangular, and exceedingly sharp; the second spur, on the last joint, being smaller, broad, and curved, and roughly resembling in shape and size a lion's claw. There is another stinking peculiarity. The skin is _emphysematous_--that is, bloated and yielding to pressure. It crackles when touched, and the surface, when the feathers are removed, presents a swollen bubbly appearance; for under the skin there is a layer of air-bubbles extending over the whole body and even down the legs under the horny tesselated skin to the toes, the legs thus having a somewhat massive appearance. And now just a few words about the position of the screamer in systematic zoology. It is placed in the Family Palamedeidae, which contains only three species, but about the Order it belongs to there is much disagreement. It was formerly classed with the rails, and in popular books of Natural History still keeps its place with them. "Now the rail-tribe," says Professor Parker, speaking on this very matter, "has for a long time been burdened (on paper) with a very false army list. Everything alive that has had the misfortune to be possessed of large unwieldy feet has been added to this feeble-minded cowardly group, until it has become a mixed multitude with discordant voices and with manners and customs having no consonance or relation." He takes the screamer from the rail-tribe and classes it with the geese (as also does Professor Huxley), and concludes his study with these words:--"Amongst living birds there is not one possessing characters of higher interest, none that I am acquainted with come nearer, in some important points, to the lizard; and there are parts of the organization which make it very probable that it is one of the nearest living relations of the marvellous _Archaeopteryx_"--an intermediate form between birds and reptiles belonging to the Upper Jurassic period.