444 GAME-BIRDS. 
and Central America to Colombia; and, as might be expected, the bird varies some- 
what in the different parts of its range. The aburria (Aburria aburrv) includes 
but a single species found in the United States of Colombia and Ecuador, and may 
be at once recognised by its black plumage glossed with dark green, and the worm- 
like wattle situated on the naked part of the fore-neck. Finally, there are two 
species with the chin, throat, and fore-part of the neck covered with feathers com- 
prising the last genus (Chamapetes). 
THE HOATZIN. 
Family OPISTHOCOMID. 
The very remarkable pheasant-like. bird from the northern and western 
districts of South America, known as the hoatzin (Opisthocomus hoatzin), appears 
on the whole to be most nearly allied to the game-birds, and may therefore be 
mentioned here. Many ornithologists regard it, indeed, as representing a distinct 
order, but as the Editor does not see the advantage of unnecessarily multiplying 
ordinal terms, it is alluded to here merely as forming a family. On examining the 
skeleton of this bird, which has many striking peculiarities, the observer will be 
struck by the form of the breast-bone, with its nearly parallel lateral edges and 
feebly developed keel, of which the anterior part is cut away, and the posterior 
portion broad and flattened out. On this flattened surface the greater part of 
the weight of the body is supported when the bird is at rest. Another striking 
feature is the shoulder-girdle, the bones of which are completely welded to one 
another as well as to the breast-bone. The crop is enormous, and occupies the 
upper portion of the chest, being placed in a deep cavity in the pectoral muscles. 
The nest of these birds, which is built of sticks and placed in bushes near the 
water's edge, contains two or three, and sometimes as many as five oval-shaped 
eggs of a white colour, doubly spotted with rufous and purple, and remarkably 
rail-like in character. Unusual interest attaches to the young, which are hatched 
naked, with the thumb and index-finger provided with well-developed claws, en- 
abling them to climb about among the branches soon after they are hatched; the 
bill, as well as the legs and wings, being used for holding on to the twigs. Moreover, 
when compelled, they are able to swim and dive with equal facility. The hoatzin 
spends its existence among the branches, consuming enormous quantities of leaves, 
and in spite of its large wings, possesses only the most limited powers of flight. 
THE BUSTARD-QUAILS or HEMIPODES. 
Family TURNICID. 
The little bustard-quails, usually included among the game-birds, and associated 
with the quails, are, however, so extremely distinct that they are frequently regarded 
as forming an order equal in importance though not in numbers to the Galline. 
While in some respects they approach both the pigeons and game-birds, their 
affinities with the rails are undoubted, and we prefer, therefore, to leave their serial 
