authorUnknown author Description Robert H. Ivy and Alwin Haagner Depicted people Robert H. Ivy (left); Alwin Haagner Date 1908 date QS:P571,+1908-00-00T00:00:00Z/9
Before Image: Avicultural Magazine. Text Appearing After Image: From Haagner & Ivy's "Sketches of South African Bird-Life. Bale & DanielssoQ, Ltd. KNYSNA
following description of the phenomenon is given by Messrs. A. K. Haagner, F.Z.S, and R. H. Ivy— The extremity of the beak in the nestling is furnished with