Why do they sing? What do they have to sing about? Somewhat apart from one another, separated by roughly equal distances, facing outward from the water, they clank and croak all through the night with tireless perserverance. To human ears their music has a bleak, dismal, tragic quality, dirgelike rather than jubilant. It may nevertheless be the case that these small beings are singing not only to claim their stake in the pond, not only to attract a mate, but also out of spontaneous love and joy, a contrapuntal choral celebration of the coolness and wetness after weeks of desert fire, for love of their own existence, however brief it may be, and for joy in the common life.
Has joy any survival value in the operations of evolution? I suspect that it does; I suspect that the morose and fearful are doomed to quick extinction. Where there is no joy there can be no courage; and without courage all other virtues are useless.
~ Edward Abbey, Desert Solitaire