THE YELLOW-CRESTED COCKATOO. 
PLYCTOLOPHUS SULPHUREUS. VIEILL. 
THe Cockatoos have a strong, broad, and well curved 
beak ; their eyes are surrounded by a naked space; their 
tail is short, square, and equal at the end; and their 
head is furnished with a remarkable crest of long and 
slender feathers, which may be raised or depressed at 
will, and are frequently of a different colour from the 
rest of the plumage. This latter character forms the 
most distinguishing mark of the group, which is partly 
indigenous to India and the Indian Islands, and partly 
to Australia. They are fond of damp and marshy situa- 
tions, and usually inhabit the neighbourhood of rivers 
or of smaller streams, in which they indulge themselves 
