Their way lies through snow-covered valleys, forests and deserts, and is 528 days. Days, in fear, in fear of attacks by big predators.
They carry goods from the most Northern cities on the planet. Pass through the second city and go to the southernmost city. The cargo that they carry a variety. From North of the city is fish and skins from southern food in the form of vegetables, fruits and berries. From the second city, they're getting wool and meat. These caravans always consist of mammoths and large hardy Buffalo. They can easily overcome thousands and thousands of miles with a heavy load and feel fine in the heat still in the cold.
In a caravan of thousands of heads, only three people, they ensure that no one fell behind, distribute feed in camp and examine the wounded. As each person in possession of the horn, the masters are able to publish them more than a hundred sounds of large predators, thus discouraging smaller.
The very same way animals know they are led by the oldest mammoth. He knows where to go in case of a large predator, if it is too deep snow and know where to pass the river ford.
In Wrotham city join rhinos riffls, they are not as durable and can not pass all three cities, they are only third to South and back again, and some leave to send another caravan, as the animals are very tired