We hear the song long before we reach the pond itself ― the rolling, rhythmic voices rising up from among the grasses all around us as if we have entered the halls of some vast monastery during evening prayer. The thrum washes over us in the darkness. We step carefully, sweeping our flashlights back and forth across the path. The kids are tense with eager excitement for the hunt, whispering questions at each unfamiliar noise, flicking their flashlights over every stray stone or lump in the grass hoping to catch a glimpse of movement ― the flexing muscular limbs or the bulging throat of a frog. But there are too many of us. By the time we've reached the water's edge, the low chanting voices have dropped away and the whole place has fallen into silence.