[birdky] Bird behavior/ID question

I've seen lots of very plain all over grayish birds, buzzing their heads off, 
while a male Northern Cardinal feeds them.  Are these gray birds what young 
Cardinals look like? I have also read about some species laying their eggs in 
another bird's nest. Does anyone know the story about these little buzzy 
beggars?
   
  Best birding wishes,
  Ben Albritton
   

       
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