American vampire-bat. Fancy a creature measuring twenty-eight inches in expanse of wing, its large leathery ears standing out from the sides and top of the head, and an erect spur-shaped appendage on the tip of the nose,—the grin, and the glistening black eye, all combining to make up a figure which reminds one of some mocking imp of fable. No wonder that imaginative people have conferred diabolical instincts on so ugly an animal.
Ugly as is the broad leaf-nosed family of bats, it is in reality the least harmless. The little grey Phyllostoma is the guilty blood-sucker which visits sleepers and bleeds them in the night. It is of a dark grey colour, striped with white down the back, and having a leaf-like fleshy expansion on the tip of the nose. Although they undoubtedly attack sleeping people, yet they appear to be somewhat partial as to the individuals they select. Bates, when sleeping in a room up the Amazon, long unused, was awoke at midnight by a rushing noise made by vast hosts of bats sweeping round him. The air was alive with them. They had put out the lamp, and when he relighted it the place appeared black with the impish multitudes that were whirling round and round. After he had laid about him well with a stick for a few minutes they disappeared among the tiles; but when all was quiet again, they returned once more and extinguished the light. The next night several got into his hammock, and on waking in the morning he found a wound, evidently caused by one of them, on his hip. There were altogether four species. One of them (the Dysopes perotis) has enormously large ears, and measures two feet from tip to tip of the wings. The natives, however, assured him that it was the phyllostoma which had inflicted the wound, and they asserted that it is the only kind which attacks man. But Mr Bates considers that several kinds of bats have this propensity.
Darwin, when travelling in Chili, noticing that one of the horses was very restive, went to see what was the matter; and fancying that he could distinguish something, put his hands on the beast’s withers, and discovered a vampire-bat. In the morning, the place where the wound had been inflicted was easily distinguished by being slightly swollen and bloody.
Waterton describes the mode in which the vampire-bat makes the orifice through which to suck its victim’s blood. It does so by pressing gently the point of its sharp projecting teeth, noiselessly circling round, and making them act the part of a centre-bit,—performing the operation so quietly that no pain is felt. He says, however, that at times they commit a good deal of mischief. A young Indian boy suffered greatly by being frequently attacked; and the son of an English gentleman was bitten so severely on the forehead, that the wound bled freely on the following morning. The fowls also suffered so terribly that they died fast; and an unfortunate jackass on whom they had set their fancy was almost killed by inches.
The vampire rises in the air by means of a wide flattened membrane connecting the whole of the limbs and tail, the thumb of the fore-paws and the hind-feet alone being left free. This membrane, though wonderfully delicate, is furnished with minute blood-vessels. It also possesses a system of nerves of the most exquisite power of sensation, which enables it to fly rapidly among the boughs and foliage, avoiding all impediments even in the darkest hours of night. The vampire can run along the ground and climb trees by means of the sharp hooks on the fore-paws. They sleep, however, like ordinary bats, hanging by their hind-feet—being thus able at a moment’s notice to take to flight.
Of the other species, some have the fur of a blackish colour, some of a ruddy hue.
When flying, the larger ones wheel heavily round and round, somewhat in the manner of a pigeon, so that they may easily be mistaken for birds. Although they live largely on insects, they also greedily devour fruits; indeed, some species live chiefly on them. Bates opened the stomach of several, and found them to contain a mass of pulp and seeds of fruit, mingled with a few remains of night insects. On comparing the seeds taken from their stomachs with those of cultivated trees, he found that they were unlike any of them: he concludes, therefore, that they resort to the forest to feed, coming only to human habitations in the morning to sleep, where they find themselves more secure from animals of prey than in their natural abodes in the woods.