Philo Judaeus De Confusione Linguarum 6

And there is also another story akin to this, related by the devisers of fables, concerning the sameness of language existing among animals: for they say that formerly, all the animals in the world, whether land animals, or aquatic ones, or winged ones, had but one language, and that, just as among men Greeks speak the same language as Greeks, and the present race of barbarians speak the same language as barbarians, exactly in the same manner every animal was able to converse with every other animal with which it might meet, and with which it did anything, or from which it suffered anything, so that they sympathised with one another at their mutual misfortunes, and rejoiced whenever any of them met with any good fortune;