Rats and Mice. There are more than 300 varieties of rats and mice, and they are found almost everywhere. The rat is an irrepressible stowaway, and following toothsome cargoes on board ship has made his way nearly all over the world. This may be said, in a less degree, of the mouse. The better known varieties of rats are the Brown Rat, the Black Rat, the Water Rat, the Beaver Rat, the Musk Rat, the Lemming, the Pouched Rat, &c., &c. The principal varieties of the mouse are, the House Mouse, the Fieldmouse, the Harvest Mouse, the African Mouse and the Dormouse.
The Rat Family. The brown rat is the species common in England, and best known throughout the world. It is said to have travelled from Persia to England less than two hundred years ago and to have spread from thence to other countries visited by English ships. It measures about nine inches, and is of a light brown colour. It multiplies very fast and once colonised is very difficult of extermination. It is larger and stronger than the black rat which it found in England when it came and which it has almost entirely destroyed and replaced. The brown rat is often mistaken for the water rat as it will take to the water on occasion and is often found in ditches and watery places. The water rat is common to central and northern Europe and is well known in England and Scotland. It differs little from the brown rat in appearance, and inhabits the banks of rivers and ponds. The black rat is of a deep iron grey, or nearly black. It is about seven inches long and in other respects bears a close resemblance to the brown rat. The beaver rat is a native of America and measures about fourteen inches exclusive of tail. It resembles the beaver in form, is fond of the water and swims well. At the approach of winter it builds itself little dome-topped houses, in which it hibernates in families. In the spring its flesh is good eating, but later it acquires a musk-like flavour which is disagreeable. It is easily tamed when young. The Muskovy musk rat is about the size of the common rat; it has a long and slender nose; no external ears; and very small eyes; the tail is compressed sideways, and its hind feet are webbed; it is of a dusky colour; the belly is of a light ash. It is a native of Lapland and Russia, in the former of which countries it is called the Desman; it frequents the banks of rivers, and feeds on small fish. The Hudson's Bay lemming is covered by very fine soft and long hair of an ash colour. In winter it is white. The limbs are quite short and the fore feet being formed for burrowing, are very strong. The Lapland lemming resembles the preceding and is remarkable for its extensive migrations. When a severe winter is approaching, the lemmings migrate southward, and move in a straightforward direction with such inflexible regularity, that, sooner than deviate from it, they will perish in attempting to pass over any obstacle which they may find in their way. The pouched rat belongs to America and is found in Florida, Georgia, and Missouri. It is brown in colour and lives in burrows under ground. The cheek pouches are external and are said to be used for the purpose of carrying food and also of removing sand loosened in the process of burrowing.
The Hamster. The hamster is a curious little rat-like animal of the thrifty kind, that lays up store in the summer for winter use. It lives in burrows which it connects with various apartments, used as storehouses for food. On the approach of the cold weather it closes the entrance to its burrow, and makes a nest of straw in which it sleeps; becoming torpid in extreme cold.
Swarms of Rats. The rapidity with which rats multiply, makes them troublesome and unpleasant neighbours. In the vicinity of the horse slaughter-houses at Montfaucon, near Paris, some years ago, they had become so numerous that the proposal to remove the slaughter houses was opposed on the ground of the danger that would accrue to the inhabitants from the rats being deprived of their means of subsistence. It was said that the carcases of thirty-five horses, if left unprotected, would be eaten by these rats in one night, the bones being picked clean. On one occasion, the carcases of three horses were placed in a high walled enclosure, small holes having been made in the walls for the admission of the rats, and subsequently stopped up. Several men armed with torches and sticks, then entered the yard, which was so full of rats that they could strike right and left without aim and yet be sure of destroying them. Two thousand six hundred and fifty rats fell victims to this experiment in one night. At the end of a month, the experiment having been several times repeated, sixteen thousand and fifty rats had been killed. The danger accruing from the burrowing of such enormous quantities of rats is by no means slight.
Invaded by Rats The story of Bishop Hatto and the invasion of the "Mäusethurm" on the Rhine by rats, is well known if not entirely authentic. Some idea of what it would be to be invaded by rats, may be gathered from Mrs. Bowdich's graphic account of her own painful experiences. "When living in Cape Coast Castle, I used to see the rats come in troops past my door, walking over my black boys as they lay there, and who only turned themselves over to present the other sides of their faces and bodies when the rats returned, and thought it a good joke. The fiercest encounter which I ever had with them was during one of those terrific storms which are more furious between the tropics than elsewhere. I was then, however, under the Equator, in a native hut, and heard an exceeding rustling and movement all around me. To my terror I perceived that these proceeded from a number of rats running up and down the sides of the room in which I was to pass the night, and who shortly began to run over me, they being disturbed by the torrents of rain which were then falling. The only weapon I could find was a shoe, and curling myself into a large arm-chair taken out of a French vessel, and covered with blue satin damask, I sat prepared for my enemies, whom I dreaded much more than the lightning, which was flashing across the iron bars laid upon the floor. I felt that the silk of my place of refuge was some sort of protection against this; but my own arm could alone save me from my four-footed foes. Presently my husband came in, and saluted me with a shout of laughter, which, however, abated when he saw my antagonists. The storm lulled for a while, and the rats retreated. We then crept within the curtains of bamboo cloth which encircled a rude imitation of a fourpost bedstead, but I kept possession of my shoe. Weary with watching, I closed my eyes, but was awakened by a tremendous flash of lightning, immediately followed by awful thunder and a tumultuous rush of rats. Some of them scrambled up the outside of the curtains; but, arms in hand, I sat up, and directed by the noise, I hurled the invaders to the ground, till at length resistance and the passing away of the storm allowed me to sleep in peace." This was the brown rat so familiar all over the world.
Migrations of Rats. The habit of rats to migrate in numbers, apparently well ordered, and under leadership, has often been noticed, and the way in which they will leave a burning house or a sinking ship has often been recorded. These companies will as a rule pass on their own way, and mind their own business if unmolested, but instances are recorded of their attacking and severely biting those who have opposed their progress. The Rev. Mr. Ferryman, who resided at Quorn in Leicestershire and who made somewhat of a study of rats, was walking in a meadow one evening when he observed a large number of rats in the act of migrating from one place to another. He stood perfectly still, and the whole assemblage passed close to him. His astonishment, however, was great when he saw amongst the number an old, blind rat, which held one end of a piece of stick in its mouth while another rat had hold of the other end of it, and thus conducted its blind companion.
The Intelligence of Rats. Some remarkable illustrations of the intelligence of rats have been recorded from time to time. The following which occurred recently seems to show both thought and reason. A Burley rat found a dead hen in a field, one evening, and departed to inform his brethren of the discovery, when a gentleman, who afterwards reported the incident to the Leeds Evening Post—removed the prize, which the speedy return of half-a-dozen rats was too late to secure. The first rat plainly evinced his disappointment, but his friends suspected him of hoaxing them, turned upon him suddenly, and in a few moments he was as dead as the chicken which had disappeared, and was left lying on almost the same spot which it had occupied. Captain Brown tells the following story of the ingenuity of the rat in self-preservation. "During the great flood of September, the 4th, 1829, when the river Tyne was at its height, a number of people were assembled on its margin. A swan at last appeared, having a black spot on its plumage, which the spectators were surprised to find, on a nearer approach, was a live rat. It is probable it had been borne from its domicile on some hay rick, and, observing the swan, had made for it as an ark of safety. When the swan reached the land, the rat leapt from its back, and scampered away."
Saved by a Rat. Perhaps no better example of the intelligence of the rat could be given than that afforded by the incident quoted by Jesse from Mr. Ferryman. Mr. Ferryman records that he had an old friend, a clergyman, of retired and studious habits. When sitting in his room one day, he saw an English rat come out of a hole at the bottom of the wainscot; and threw it a piece of bread. In process of time, he so familiarised the animal, that it became perfectly tame, ran about him, was his constant companion, and appeared much attached to him. He was in the habit of reading in bed at night; and was on one occasion awoke by feeling a sharp bite on his cheek, when he discovered the curtains of his bed to be on fire. He made his escape, but his house was burnt down, and he saw no more of his rat. He was, however, convinced, and remained so for the rest of his life, that his old companion had saved him from being burnt to death, by biting his cheek; and thus making him aware of his danger.
The Mouse. The mouse is a much more popular animal than the rat, though taking its size and numbers into account it is scarcely less destructive. No one weeps when the rat suffers capital punishment, but many a tear has been shed over a "dear little mouse". The house mouse is too well known to need description. Like rats, mice appear to act in companies, either under leadership or by common consent. Mrs. Bowdich describes a number of mice which she observed during an illness frequently emerge from her bed-room closet and gravely form themselves into a circle and apparently hold a council. That they frequently combine to effect purposes which they are unable to accomplish singly is well known. Mrs. Bowdich describes an attempt made by a combined force of mice to get possession of the dainties provided for her as she approached convalescence. These were placed under tin covers upon a chest of drawers, and the mice were evidently of opinion that if they could only climb to the top of these covers they would find them open like a basin, and so effect an entry. Unable to gain a footing on the smooth metal sides, "they mounted upon each other's shoulders and so accomplished the feat", though like arctic explorers they failed to find an open sea and were compelled to return with disappointment. An organised attempt to remove a cover from the bottom, when, on one occasion, it had not been firmly set down, resulted in an accident similar to those incident to human engineering, for the cover slipped and many tiny hands were severely pinched. After this they abandoned their attempts though a single mouse would occasionally reconnoitre the scene, apparently unsatisfied with the defeat. Mice, like many other animals, are said to be much affected by music.