All the animals in the island, however, seem to be wild for the following reason.
The shepherds are not able to follow their cattle as they graze, owing to the island being thickly wooded, rough, and precipitous, but when they want to collect the herds they take up their position on suitable spots and call them in by trumpet, all the animal without fail responding to their own trumpet.
So that when people touching at the island see goats and oxen grazing by themselves and then attempt to catch them, the animals will not approach them, being unused to them, but take to flight.
When the shepherd sees the strangers disembarking and sounds his trumpet the herd starts off at full speed to respond to the call. For this reason the animals give one the impression of being wild, and Timaeus, after inadequate and casual inquiry, made this random statement.
It is by no means surprising that the animals should obey the call of the trumpet; for in <a class="linkToPlace" target="_blank" href="/place?placename=Italy&groupId=656&placeId=1199">Italy</a> those in care of swine manage matters in the same way in pasturing them.
The swineherd does not follow behind the animals as in Greece but goes in front and sounds a horn at intervals, the animals following him and responding to the call.
They have learnt so well to answer to their own horn that those who hear of this for the first time are astonished and loth to believe it.
For owing to the large labouring population and the general abundance of food the herds swine in <a class="linkToPlace" target="_blank" href="/place?placename=Italy&groupId=656&placeId=1199">Italy</a> are very large, especially among the Etruscans and Gauls, so that a thousand pigs and sometimes even more are reared from one sow.
They, therefore, drive them out from their night quarters in different troops according to their breed and age.
Thus when they cannot keep the different classes apart, but they get mixed either when they are being driven out, or when they are feeding, or when they are on the way home.
They, therefore, invented the horn-call to separate them when they get mixed without trouble or fuss.
For when one of the swineherds advances in one direction sounding the horn and another turns off in another direction, the animals separate of their own accord and follow the sound of their own horn with such alacrity that it is impossible by any means to force them back or arrest their course.
In Greece, on the contrary, when different herds meet each other in the thickets in their search for acorns, whoever has more hands with him and has the opportunity includes his neighbour's swine with his own and carries them off,
or at times a robber will lie in wait and drive some off without the man in charge of them knowing how he has lost them, as the swine become widely separated from their conductors in their race for the acorn when the fruit just begins to fall. But this is enough on this subject.
Walbank Commentary