310 
THE POULTRY BOOK. 
GREY CALL LUCKS, 
quacking, in a shrill high note, which can be heard a great distance, and which 
renders them admirable as decoy ducks to allure the wild species to their 
destruction. 
As fancy water-fowl on ornamental pieces of water, both varieties are very 
attractive. 
THE PENGUIN DUCK. 
This very extraordinary-looking duck is characterized by an extreme shortness 
of the femora, the thigh or upper hones of the legs ; hence their feet are not 
brought, as in other ducks, under the middle of the body, at an equal distance 
from the head and tail, but are placed much farther behind. In consequence of 
this peculiarity of structure, the duck, in order to bring the centre of gravity 
over the point of support, is obliged to assume an erect attitude, like that of the 
Penguin, or other diving birds whose feet are placed in the same position. 
Beyond this quaint peculiarity, the Penguin duck has no speciality to call for 
particular observation, or to distinguish it from the ordinary species, of which it 
is evidently only an accidental variation, perpetuated by the care of man. The 
colours of the Penguin duck are varied, and the bird breeds freely with any of 
the common varieties. 
THE HOOKED-BILLED DUCK. 
The Hooked-billed duck is another accidental variation which has been propagated 
by man. It is characterized by the bill being turned downwards, instead of being 
straight, as in the other varieties. In Holland this variety was formerly not 
unfrequent, and was frequently delineated by the old Dutch masters. In colour 
and size, the Hooked-billed ducks varied very considerably. 
