Thanks Alicia Plotkin for pointing this out: in spite of the fact that the 
female Barred Owl is larger than the male, the call of the male IS pitched 
lower than the female. So, from what I recall, it was the male that came in 
first to our playback followed a short time later by the female. It makes sense 
that the male would have the primary role in driving away intruders.

Bob McGuire

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