100 
SHEILDRAKE. 
domesticated, and in a wild state feeds chiefly on 
grains or seeds, and insects ; during incubation they 
are partially arboreal in their habits, perch on trees 
and place their nests in the hollow trunks or 
branches. 
Tadok.na, Leach. — Generic characters . — Bill de- 
pressed at tip, slightly undulated in its la- 
teral outline, slightly dilated at the tip, base 
elevated with a knob in front ; maxilla con- 
cealing the mandible ; lamella} scarcely visible 
externally, not developed ; wings long, tcrtials 
broad, carpal joints with a rudimentary knob ; 
tarsi with hallux articulated high. 
Types . — Tadorna Belonii, fyc. 
Note . — Breed in holes. Europe, Asia. 
