The Making of Species 
are the leading colours of the Amherst white and 
green, instead of red and gold, but it is a bigger 
bird with a larger tail and smaller crest, and a 
bare patch round the eyes. 
The Pintail Duck (Dafila acuta) and the 
Mallard or Wild Duck and its domestic descen- 
dants (Aas boscas), when bred together, produce 
hybrids which have been proved fertile between 
themselves and with the pure pintail. Any 
sportsman or frequenter of our parks can see for 
himself the distinctness of the species concerned. 
The Pied Wagtail (Motaczlla lugubris) and the 
Grey Wagtail (JZ. melanope) have produced 
hybrids in aviaries, which have proved fertile. 
The two species are distinct in every way, as 
all British ornithologists know. 
The Cut-throat Finch (Amadina fasciata) and 
Red-headed Finch (A. erythrocephala) of Africa 
have hybridised in aviaries, and the produce has 
proved fertile. The red-headed finch, among 
other differences, is far larger than the cut-throat, 
and the males have the head all red, not merely 
a throat-band of that colour. 
The Japanese Greenfinch (Lzgurinus sinicus) 
which is not green, but brown and grey, with 
bolder yellow wing- and tail-markings than our 
larger European greenfinch, has produced fertile 
hybrids with this latter bird. 
The Red Dove of India (Oenopopztia trangue- 
barica) has produced hybrids with the tame 
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