Jerdon says of this rat that the muzzle is sharper than that of the brown rat; the ears are more oval; it is lighter in its make, and has much longer hair.
Whether this rat be, as Jerdon seems to suspect, imported into India in ships or not, it is generally supposed to have had its origin in southern Asia, and is almost identical with the Egyptian rat (M. Alexandrinus). It was the common rat of England, and indeed of northern Europe, whence it was expelled by its formidable rival, the brown rat, before which it has gradually receded, and it is seldom found now in England.
[NO. 333. MUS DECUMANUS.]
The Brown Rat (Jerdon's No. 176).
NATIVE NAMES.—Ghur-ka-chuha, Hindi; Demsa-indur, Bengali; Manei-ilei, Canarese; Gaval-meeyo, Singhalese.
HABITAT.—Throughout India, Ceylon, and in some parts of Burmah.
DESCRIPTION.—Fur greyish-brown, mixed with tawny above, with longer piles of a dark colour, almost black; ears round; tail generally longer than head and body, scaly, with short bristles at the margins of the rings.
SIZE.—Head and body, from 8 to 10 inches; tail, from 6 to 11 inches.
The brown rat of India is identical with that of Europe, most naturalists being now agreed that it originally came from the East. It was supposed by Pallas that the brown rat crossed over into Russia about the year 1727. When frightened by an earthquake, numbers swam over the Volga from countries bordering on the Caspian Sea. It seems to have driven out the black rat before it wherever it made its appearance. In England it was introduced by shipping about the middle of the last century, and has since then increased to such an extent as to swarm over the whole country, and render the old English black rat a comparatively rare animal. From its ferocity and fecundity the brown rat is a veritable pest; if it cannot beat a retreat from an enemy it will show most determined fight, and in large numbers will attack and kill even men. A story is related by Robert Stephenson, the great engineer, that in a coal-pit in which many horses were employed, the rats, allured by the grain, had gathered in large numbers. On the pit being closed for a short time, and the horses being brought up, the first man who descended on the re-opening of the work was killed, and devoured by the starving rats. Similar stories have been told of men in the sewers of Paris. In the horse slaughterhouses at Montfaucon in Paris, the rats swarm in such incredible numbers that the carcases of horses killed during the day would be picked clean to the bone during the night; sometimes upwards of thirty horses would be so devoured. This shows the carnivorous tendencies of these abominable pests. I confess to a general love for all animals, but I draw the line at rats. There is something repulsive about one of these creatures, and a wicked look about his large protruding eye, like a black glistening bead, and his ways are not pleasant; instead of keeping, as he ought, to sweet grain and pleasant roots, he grubs about for all the carrion and animal matter he can get.
I find there is no bait so enticing to the brown rat as a piece of chicken or meat of any kind. I have heard stories of their attacking children, and even grown-up people when asleep, but I cannot vouch for the truth of this beyond what once happened to myself. I was then inhabiting a house which swarmed with these creatures, and one night I awoke with a sharp pain in my right arm. Jumping up, I disturbed a rat, who sprang off the bed, and was chased and killed by me. I found he had given me a nip just below the elbow. I once had a most amusing rat-hunt in the house I now occupy. I had then just taken it over on the part of the Government, in 1868. The whole building is floored with polished marble, which, being new, was like looking-glass. I found an enormous rat, which I took for a bandicoot, in one of the bath-rooms, and, shutting him in for a while, I closed the doors of a very large room adjoining, which was quite empty, and then turned my friend in with a small black-and-tan terrier. The scrimmage that ensued was most laughable, as both rat and dog kept slipping and sliding all over the place. At last the former was pinned in a corner, where he made a most determined stand, and left several marks before he died. They seldom now come so high as the third story, but we had two or three last year which dug a hole through a brick wall into my study, and they were surreptitiously disposed of unknown to my eldest little girl, whose passionate love for every living creature made her take even the rats under her protection, and one of them would come out every morning in the verandah to be fed by her with crumbs and grain. This one was spared for a while, but I was not sorry to find one day that it had fallen into a tub of water in a bath-room and was drowned.
The brown rat breeds several times in the year, and has from ten to fourteen at a time, and it is to be hoped that there is considerable mortality amongst the infants. I have never kept rats as pets, but have noticed amongst mice a tendency on the part of the mother to devour her offspring. I have no doubt that this also is the case with the brown rat, and aids in keeping down its numbers. It is stated that they will attack, kill, and eat each other. The Rev. J. G. Wood remarks in his Natural History: "From some strange cause the male rats far outnumber the females, the proportion being about eight of the former to three or four of the latter. This disproportion of the sexes may possibly be caused by the cannibalistic habits of the rat, the flesh of the female being more tender than that of the opposite sex. Whatever may be the cause, it is clear that the wider increase of these creatures is greatly checked by the comparative paucity of females." During the late siege of Paris by the Germans, amongst the various articles of food which necessity brought into use, rats held a high place as a delicacy. It is a difficult matter to stop the burrowing of rats; the best plan is to fill the holes with Portland cement mixed with bits of bottle glass broken in small pieces. It is said that quicklime will temporarily prevent rats from entering a hole, as the lime burns their feet. A friend of mine lately told me of some wonderful Japanese bird-lime which he uses. It is spread on a board, and will retain any rat that puts even one foot on it. An albino variety is common, and is sold for pets. Rats are partial to certain scents, and some are consequently used by trappers. In Cooley's 'Cyclopædia' the following receipts are given:—