BREEDING HABITS OF WEAVERBIRDS—FRIEDMANN 315 
are strongly suspected of having the same habit. Many more details 
have still to be learned of the annual cycle of behavior patterns in 
these birds before it may be possible to attempt to determine the 
precise causes and the subsequent evolutionary paths that twice in 
the history of the weaverbirds have lead from nesting and incubation 
and caring for the young to a state of brood parasitism. 
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