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Frogs in their coupling use a call, the so-called ololygon,See Gow on Theocritus, vii. 139; Boulenger, Animal Mysteries, pp. 67 f. a cry of wooing and mating. When the male has thus attracted the female, they wait for the night together, for they cannot consort in the water and during the day they are afraid to do so on land; but when the darkness falls, they come out and embrace with impunity. On other occasions when their cry is shrill, it is because they expect rain. Cf. Mor. 912 c-d; Aratus, Phaenomena, 946 ff.; Cf. Aelian, De Natura Animal. vi. 19; ix. 13. And this is among the surest of signs.