PICARIAN BIRDS 



151 



taken from the nest of a diamond-sparrow (Petronia petronella) was very large 

 for its age; here again exhibiting a cuckoo-like feature. The mention of a 

 single nestling in this instance suggests that the honey-guides lay only one egg 



HELMETED TUKACO. 



in a nest. As Indicator is common to Africa, Malaya and the Himalaya, it 

 would be interesting to ascertain if the parasitic habits of the African species are 

 shared by their Asiatic cousins ; but as the Himalayan bird is believed to lack the 

 " honey -guiding " habit of the South African species, it may also differ in the matter 



