Throughout the winter our feeders have been visited by a small c. Wren. Today 
it was joined by a notably larger one. Probably the other half of the pair that 
has nested here for several years.  There is a clear size difference in that 
pair. If sex doesn’t account for size differentiation  
 in this species what might explain it?
Do sub species interbreed?
Best,
Bard 

 Bard Prentiss 

(607)882-0504


Best,
Bard 

 Bard Prentiss 
(607)882-0504
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