Hence there will be no difficulty in perceiving that animals are possessed of other instincts besides those previously mentioned. In fact, there are certain antipathies and sympathies among them, which give rise to various affections besides those which we have mentioned in relation to each species in its appropriate place. The swan and the eagle are always at variance, and the raven and the chloreus[1] seek each other's eggs by night. In a similar manner, also, the raven and the kite are perpetually at war with one another, the one carrying off the other's food. So, too, there are antipathies between the crow and the owl, the eagle and the trochilus;[2]—Between the last two, if we are to believe the story, because the latter has received the title of the "king of the birds:" the same, again, with the owlet and all the smaller birds.

Again, in relation to the terrestrial animals, the weasel is at enmity with the crow, the turtle-dove with the pyrallis,[3] the ichneumon with the wasp, and the phalangium with other spiders. Among aquatic animals, there is enmity between the duck and the sea-mew, the falcon known as the "harpe," and the hawk called the "triorchis." In a similar manner, too, the shrew-mouse and the heron are ever on the watch for each other's young; and the ægithus,[4] so small a bird as it is, has an antipathy to the ass; for the latter, when scratching itself, rubs its body against the brambles, and so crushes the bird's nest; a thing of which it stands in such dread, that if it only hears the voice of the ass when it brays, it will throw its eggs out of the nest, and the young ones themselves will sometimes fall to the ground in their fright; hence it is that it will fly at the ass, and peck at its sores with its beak. The fox, too, is at war with the nisus,[5] and serpents with weasels and swine. Æsalon[6] is the name given to a small bird that breaks the eggs of the raven, and the young of which are anxiously sought by the fox; while in its turn it will peck at the young of the fox, and even the parent itself. As soon as the ravens espy this, they come to its assistance, as though against a common enemy. The acanthis, too, lives among the brambles; hence it is that it also has an antipathy to the ass, because it devours the bramble blossoms. The ægithus and the anthus,[7] too, are at such mortal enmity with each other, that it is the common belief that their blood will not mingle; and it is for this reason that they have the bad repute of being employed in many magi- cal incantations. The thos and the lion are at war with each other; and, indeed, the smallest objects and the greatest just as much. Caterpillars will avoid a tree that is infested with ants. The spider, poised in its web, will throw itself on the head of a serpent as it lies stretched beneath the shade of the tree where it has built, and with its bite pierce its brain; such is the shock, that the creature will hiss from time to time, and then, seized with vertigo, coil round and round, while it finds itself unable to take to flight, or so much as to break the web of the spider, as it hangs suspended above; this scene only ends with its death.