342 
EASTERN ETHIOPIA 
XXVIII 
material dries it liardeiis like cement. There are many 
facts to be ascertained in regard to the process by 
which the hen is immured. It is illustrated by an 
actual specimen of the Crowned Hornbill, in the 
admirable Nesting Scries in the Natural History 
Museum, London. Dr. Schonland, who obtained the 
specimen, states that this bird moults before being 
The (t 1 round Hornbill (Bucomis) has modified feathers, like 
lashes, on its eyelids, which give this bird a weird 
human expression, especially when screwing up its 
eyelids as it quizzes an onlooker. 
imprisoned, and not only sheds the short feathers, but 
the quills of the wings and tail. This curious habit of 
immuring the sitting hen has been observed of horn- 
bills in India (Tickell) and in Burma (Mason) as well 
as by Livingstone in Africa. The observations in 
regard to the African species have been confirmed by 
Schonland, and for the Asian species by AVallace in 
Sumatra. It has been suggested that the object in 
immuring the hen during incubation is to protect her 
from the attacks of monkeys and other enemies. 
