NINTH ANNUAL -REPORT. PANS) 
OSTRICH LYING IN THE SAND. 
From a photograph by C. W. Beebe. 
years to come—the only lingering representatives of the giant 
birds which roamed the earth millions of years before the first 
human being began the ruthless work of extermination. 
PART IJ.—kExXTERNAL STRUCTURAL ADAPTATIONS TO CURSORIAL 
HABITS. 
Functional radiation is developed to so remarkable a degree 
in the Class of Birds, that we find representatives of many orders 
which have become more or less specially adapted to a terrestrial, 
cursorial life. Examples of these are the Tinamous, almost all 
the members of the Order Gallinae, the Cranes, the secretary-bird 
among the Hawks, the road-runner among the Cuckoos, and the 
Larks among the Perching Birds. Yet in all of these birds, ter- 
restrial locomotion is indulged in only as an alternative of the 
power of flight: and, except in the Tinamous, and to a less de- 
gree among the Gallinae, life on the ground has had no apprecia- 
ble effect in lessening the wing power. 
