Cam

@Lee Ann van Leer Thanks for speaking to the "nest in a crazy place" concern - and to Jonquelle for bringing it up.  I've been concerned about robins in this regard from time to time.  But I've learned to just let them sort it out.  Your explanation was really helpful.

Glad you made these points, Angela.  For me, the important idea was the huge effect of chipmunks and squirrels.  I had no idea they predated on baby birds, especially that frequently.  I generally worry most about outdoor cats and raccoons where I live in Michigan - but we have lots of both chipmunks and squirrels.  I know it's all part of the necessary order of things, but I get pretty attached to the bluebirds that nest in a box in the field next door.