16/59 The males of all, or certainly of the greater number, are jet black; and the females (with perhaps one or two exceptions) are brown. FINCHES FROM GALAPAGOS ARCHIPELAGO.1. Geospiza magnirostris.2.Geospiza fortis.3. Certhidea olivasea.) The most curious fact is the perfect gradation in the size of the beaks in the different species of Geospiza, from one as large as that of a hawfinch to that of a chaffinch, and (if Mr.Gould is right in including his sub-group, Certhidea, in the main group) even to that of a warbler. |