BIRDS—GRUIDAE—GRUS. 
553 
Family G II U I D A E . 
The diagnosis of this family has already been given on a preceding page. The species are 
all very large, and inhabit dry plains rather than marshes. The bill is moderately long ; the 
nostrils broad and pervious, the nasal groove extending but little beyond them. The legs 
are long, but the toes are short; the hind toe is very short and much elevated ; the claw 
scarcely touching the ground. 
The genera are few in number, but one, Grus, belonging to North America. 
GRUS, Linnaeus. 
Grus, Linnaeus, Syst. Nat. 1735. Type Ardea grus, L. (Gray.) 
Ch. —Bill lengthened, straight, the upper mandible only slightly deeurved at the extreme tip ; tho commissure and other 
outlines straight. Nasal groove very large and open, extending over the basal two-thirds of the bill. Nostrils broadly open, 
pervious; the anterior extremity half way from the tip of bill to eye. The upper half of the head naked, warty, but with 
short hairs. 
Legs much lengthened ; toes short, hardly more than one-third the tarsus. Inner toe rather longer, its claw much larger 
than the outer. Hind toe elevated, short. Toes connected at base by membrane. Tarsi broadly seutellate anteriorly. 
Tertials longer than primaries, deeurved ; first quill not much shorter than second. Tail of twelve feathers. 
The precise number of species of this genus in North America and their character has been 
a matter of much uncertainty, and the subject cannot even now be said to be well settled. 
Audubon admits but one, considering the brown sand-hill crane to be the young of the white 
whooping crane. This, however, is erroneous, the species being perfectly distinct. Mr. 
Cassin has detected what he considers a third species among the Smithsonian collections, to 
which he gives the name of G. fraterculus. He thinks also that in the same collection are 
specimens which may even point a fourth species very similar to, if not identical with, G. 
longirostris, Temm. 
Synopsis of species. 
A. Adult plumage white ; primaries black. Bill much longer than middle toe. 
Bill very thick ; the gonys convex, ascending ; warty portion of head extending in 
a point backward on top of head, and behind the cheeks below the eye; concealed 
by black hairs. G. americanus. 
B. Adult plumage plumbeous. 
Bill slender, longer than middle toe. Gonys straight; in line with lower edge of bill. 
Warty space of head not extending below eyes, and bifurcated behind by the extension 
forward in an angle of occipital feathers. Primaries brown with white shafts. 
G. canadensis. 
Much smaller. Bill shorter than middle toe. Gonys straight, but ascending. Head in 
young feathered to bill. Primaries black, with brown shafts. G. fraterculus. 
