NO. 4 AVIAN GENUS CLAMATOR — FRIEDMANN 45 



Furthermore, out of 13 of the parasitized nests of the Cape rook, 

 Corvus capensis, in southern Africa, described later in this paper 

 (p. 99) , 6 instances, containing a single cuckoo ^.gg apiece, held from 



12 3 4 5 6 7 8 



Number of Pica eggf p«r nest 



Fig. 12. — Intensity o/ Clamator parasitism to Pica indicated by number of 

 instances of each particular combination of egg numbers. 



1 to 4 eggs of the host, while in 7 nests with 2 cuckoo eggs apiece, 

 there were from 1 to 3 eggs of the rook. This suggests at least a 

 certain frequency of host egg removal, although it is true that other 

 more intensively parasitized nests of the same species of host in 

 southern Africa did not bear this out. 



