The Making of Species 
10, The case of certain diurnal moths mimick- 
ing butterflies appears to be explicable without 
the aid of the theory of protective mimicry. 
When two species adopt the same method of 
obtaining food, it not infrequently happens that 
a professional likeness springs up between them. 
Of this the swifts and swallows afford a striking 
illustration. 
11. Asa set-off to the cases where the alleged 
mimicry is confined to certain seasons of the year, 
we may cite the case of the pheasant-tailed 
Jacana (Hydrophasianus chirurgus), which in its 
winter plumage might easily be mistaken, when 
on the wing, for the paddy bird or Pond Heron 
(Ardeola grayiz), both being of like size and 
having a brown back, long green legs, and white 
wings. Moreover, they are to be found in 
the same localities in India. At the breeding 
season, however, they are absolutely different 
in plumage. 
Yet another argument commonly adduced in 
favour of the theory of protective mimicry is that 
local variations of the imitated species are some- 
times followed by the imitator ; thus the butterfly 
Danazs chrysifpus shows a white patch on the 
hind wings in Africa, and this is followed by 
its mimic. 
But the same thing occurs, quite irrationally, 
so to speak, among birds. The peregrine falcon 
and hobby of Europe are only winter migrants 
250 
