where are the birds

I dont know where you live, but here where I live the birds are gone, except for a scant few, where did they go? I dont have a clue, my bird feeder is still full from a month ago. It usually is emptied by my feathery friends in a couple of days. So I begin to wonder no sparrows, cardinals, wrens, chickadees, could this be a sign for us to notice, I'm not trying to be an alarmist, by I do trust the scriptures, is this a sign for us to notice or are we to busy to see it in our midst. More prayer, more Word, more attention to detail. PR