So here's what I've determined: either all of the local birds have died of a heatstroke (which is totally probable) OR birds are just really picky these days about what they eat!
We had some sweet friends bring us Monjunis this past weekend and, as always, it came with a never-ending supply of bread. So Bailey and our sweet babysitter Brooke went outside this morning and fed the birds. Bailey cracked me up saying, "Birds, come here! Come get your bread birds!" And then when she didn't see them coming immediately, "Mama, where are the birds? You said the birds would come!"
So the bread still stands. At least my dog likes it!