TK> It looks like one of our budgies has laid two eggs in with five
  TK> cockatiel eggs in one of our nesting boxes. We are sure that one of
  TK> the budgie eggs is fertile. Has anyone out there heard of a tiel
  TK> bringing up a budgie along with its' own babies. Any advice would be
  TK> appreciated.
  
I haven't heard of it, but if the cockatiel chicks are older, I'd worry about 
the tiny budgie chick getting fed.  If the budgie chick is older, I'd worry 
about it beating up on the cockatiels!
--- MacWoof 1.5.3
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