The Body of a Bird cae 
An instance of what has been called unconscious 
mimicry seems to exist in the cuckoo of the Old World, 
which, like our cowbird, is parasitical in habits, making 
no nest of its own, but depositing its eggs in the nests of 
other species of birds. The cuckoo bears a striking 
Fig. 248.—Ivory Gull. Aggressive and protective coloration in an Arctie Gull. 
resemblance to a small hawk, both in general pattern and 
in its darting flight. The name Hawk-cuckoo has been 
applied to a genus of these birds in India; the name being 
given because of the resemblance to a hawk. This simi- 
larity may be of great use in temporarily frightening 
away the owners of the nest in which the bird wishes 
