The Evensong of Animals began on a spring night when the peepers in the pond in front of my house were singing. It was a full-throated, mating song, loud enough to travel up into the sky. I imagined the sound floating up into space, past the atmosphere to travel forever. My imagination is wrong, of course. Sound waves need a medium like air, and space is a vacuum. Nevertheless, I continued with the fantasy and began to think about all the sounds that animals make as they prepare for the transition from day to night and the great chorus of growls, snuffles, roars, and tweets that rise into the sky.