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When the flower is full of nectar, the plant emits a specific vibration, inaudible to the human ear but perfectly detectable by certain insects. It is the call for a visit that will nourish the cycle of life. For this to happen, there must be no noise that hides the virtuous frequency that allows communication in nature.
We have long known that there are animals that communicate with sounds too low or too high to be directly noticed by us. The low notes of elephants travel kilometres across the savanna. Sperm whales emit a repeated burst, a kind of crackling sound, with distinct characteristics depending on the area where they usually live, much like our languages.