There is no possibility of foreseeing, or even of suggesting the impression produced by this clashing of cymbals upon those who inspire it.

The most I can say is that their impassive exterior seems to denote a complete indifference.

I do not insist that this is so; the intimate feelings of the insect are an insoluble mystery.
Another reason for doubt is this: all creatures affected by song have acute hearing, and this sense of hearing, a vigilant sentinel, should give warning of danger at the slightest sound.

The birds have an exquisite delicacy of hearing.

If a leaf stirs among the branches, if two passers-by exchange a word, they are suddenly silent, anxious, and on their guard.