TOURISTS AND SIGHT-SEERS
"Every night we must look, lest the down slope
Between us and the woods turn suddenly
To a grey onrush full of small green candles,
The charging pack with eyes flaming for flesh.
And well for us then if there's no more mist
Than the white panting of the wolfish hunger."
The desire to travel and see the great world is by no means peculiar to the human race. It is found among animals to such a degree that groups of them will often leave their homes in one country and journey to another. These strange wanderlust habits are noticed even by the casual observer, and no special insight is required to see that these wise creatures have their annual tours excellently arranged and marked out. Their route is possibly as definitely arranged before starting, as is the route of a human traveller. They have their selected eating places arranged, know every danger spot and the enemies they are likely to encounter.
The members of these co-operative tours take life tickets, and each tour lasts about one year. One of the most unusual instances of such co-operation is that of the lemmings of the Scandinavian countries. These are animals of the mouse tribe, which live in the mountainous districts. They live upon roots and grasses. They breed very rapidly. At certain times they go from the centre of Norway to the east and west, crossing valley, hill, and river in great masses. Many are destroyed by birds and beasts of prey, but finally the survivors reach the Atlantic on the Gulf of Bothnia and, for some strange unknown reason, plunge in and die. Only enough remain from one season to another to propagate the species. It is an immense co-operative suicide society.
Rivers and valleys are sometimes effectual barriers. On the plains of the Amazon great numbers of animals are found on one side of the river only; these have not been able to cross to the other. On the north side of the Rio Negro are two varieties of monkeys, the brachiurus conxion and the jacchus bicolor, which are unknown on the south side. Of course, water-loving animals, such as seals, whales, and porpoises are at home in the water and can swim for days without stopping. Quite a few animals can swim for a short distance, but comparatively few for long distances. In the early days in North America it was not uncommon for buffalo to swim across the Mississippi River. Rats and squirrels often migrate in great numbers. It oftentimes happens that Arctic animals travel from one place to another on floating ice. In the South American waters it is a common sight to see floating islands covered with plants and trees upon which there are live animals; and while these animals are likely to perish, they are oftentimes carried safely to land. Eagles have often been instrumental in bringing new species of animals to islands where they had previously been unknown, their purpose being to provide food for their own young. Some of these animals would escape and henceforth become citizens of their new habitation.
An interesting division of migrants is that of the casual travellers, like the men and women who always remain at home except when special business calls them away. Sudden climatic changes, or the scarcity of food, often cause stay-at-home animals to make tours into new territories. As a good instance, I might cite the case of three wolves, which I saw entering Jackson Park in Chicago, during very severe weather when Lake Michigan was frozen over. The morning papers stated that because of forest fires in Michigan, and the extreme cold, which not only made food scarce for the wild animals of Michigan, but froze the Lake, many of them had come across the ice into the great Chicago parks seeking food and shelter.
The subject of animal travel is full of interesting and difficult problems, and not the least interesting nor the least difficult is the question of just how they find their way to and from various places. Many naturalists tell us that these animals are led by inherited instinct along the migration lines followed by their forefathers. But even if this were true, what made them originally follow such a course?
Wild horses when travelling always have a leader as well as several sentinels for each herd. By some unknown code this leader makes known his wishes and directs the movements of the herd. No human army could have greater order or more perfect obedience to commands; and under him there is absolute unity by means of which the carnivorous animals, such as the wolf, the jaguar, and the puma, are repelled. Wild deer invariably have a leader, and while we do not know how he obtains his position, nor how he directs his followers, we do know he is highly successful in his efforts.
No act in the animal world bespeaks more intelligence than that of placing sentinels, especially during a journey. Horses show striking skill and ingenuity in the choosing and placing of their sentinels. Any one who has been fortunate enough to have seen them travelling in the forests of South America, where the wild horses are gregarious, and travel in herds of five hundred to a thousand, has noticed that sentinels are always stationed around the herd. These animals are not well prepared for fighting, and experience has taught them that their greatest safety is in flight, and so, when they graze or sleep, sentinels are always on the look-out for enemies. If a man approaches, the sentinel at first walks toward him, as if to make sure what the enemy is, and what he desires, if the man goes nearer to the herd, the sentinel neighs in a most peculiar tone. Immediately the herd is aroused, and gallops away, not in confusion, but perfect order, as though its members were human soldiers.
The same is true of the white-legged peccaries, so plentiful in Guiana. They congregate by the thousands, choose a leader whose position is always at the front, and travel for hundreds of miles through the great forests. If they come to a river, the leader halts, as if to make sure that all is well for crossing, then he plunges into the water and is followed by his immense army. The sureness of the leader would suggest that he has been over the same route many times before—perhaps this is why he has been chosen! If an enemy appears, or any form of danger is approached, they carry on an immense amount of chattering and proceed only when they have talked it out. Any hunter that should be foolish enough to attack them, unless he were already up a tree, would be torn to pieces with their terrible teeth and tusks. They are as bloodthirsty as the wild boars of the Black Forest of Germany, and will sometimes actually tear down a tree up which an enemy has escaped, that they may kill him.