Infimae Scala Naturae

A frog -- for such I take it to be, that or some other crouching thing -- emits  in the night  a rasping monotone, not the classic bivalent “ribbitt”, but more like an extended belch.   At an interval, a like vocalization blats out  from across the way, by way of response.  The cycle is destined to repeat throughout the night,  until both parties either tire, or mate.

This is as close as these beasts will ever come, to the balcony serenade to one’s Juliette.  Yet it does point along this direction.   Such creatures are needful, lest the scala naturae  wane at its base.