There's a flock of sparrows that roosts in a towering mulberry tree in the side yard. In the winter they move to a fairly tall juniper bush next to it -- tallenough to make them feel secure, and with very dense foliage, wihch must make it easier to stay warm.
Over the summer they disappeared. I suspect it was because of the cicadas -- we had cicadas in all the trees on my street, at least one to every tree, and the racket, starting in the afternoon and lasting throught he night, was increcible. I'm convinced that the sparrows left because they couldn't get any sleep.
At any rate, they've started coming back over the past few weeks -- I can hear them twittering their "Good night, sleep tight" chirps in the vening, and their wake-up chatter in the morning, and they've started appearing in the parkway, hopping around looking for something to eat.
It's sort of reassuring to have them back.