that sound summer makes

Warm days have a sound, a buzzing, a hum. Over the years I thought it might be swimming pools or air conditioners. But the summer hum is still there on warm San Francisco days, and there aren't any pools or air conditioners nearby.

My animal, still in his youth, hums when he runs too fast. I'd like to imagine the Earth is humming as the warmer days slip by, a call to be outdoors and revel in nature... before it's too late... before I miss it.