IN THE NORWICH MUSEUM. 27 
the horny portion of its bill as compared with its very 
large gape, a peculiarity which it possesses in a greater 
degree than probably any other bird of prey. Mr. 
Andersson has recorded that it feeds on bats, and he 
believed that it chiefly seeks its food in the twilight. 
The next genera, Cymindis and Regerhinus, are 
both composed of species inhabiting tropical America, 
including one species of Regerhinus, which is found in 
the Island of Cuba. They are all birds of consider- 
able beauty of plumage, especially in their immature 
stages; and the birds of the genus fegerhinus, are 
also remarkable for the extraordinary development of 
the upper mandible of the bill. The remaining species 
of the group of Perns, are contained in the two very 
closely allied genera of Aviceda and Baza. 
The genus Aviceda contains one species inhabiting 
tropical and Southern Africa, and another which is 
only found in Madagascar, and is still a desideratum 
in our Museum. 
Of the genus 4aza, one species is a native of India 
and Ceylon, another of Australia, and five others 
occur in various islands of the Indian Ocean. The 
birds of both these genera are mostly very elegant in 
the markings of their plumage, and are all of them 
more or less conspicuously crested. The species 
inhabiting India and Ceylon (Saza lophotes), though 
the smallest; is perhaps the most handsome of these 
birds, and is referred to by Mr. Layard in his notes 
on the Birds of Ceylon in the following terms :— 
