Parallel instances of invasions of animals materially affecting the prosperity of man are doubtless familiar to my readers, such as the occasional migration of lemmings, passage of rats, flights of locusts, or the ravages caused by the Colorado beetle; but many are perhaps quite unaware what a terrible plague can be established, in the course of a very few years, by the prolific unchecked multiplication of even so harmless, innocent, and useful an animal as the common rabbit. The descendants of a few imported pairs have laid waste extensive districts of Australia and New Zealand, necessitated an enormous expenditure for their extirpation, and have at the present day[191] caused such a widespread destruction of property in the latter country, that large areas of ground have actually had to be abandoned and entirely surrendered to them. It is interesting to find in the work of the Arabic geographer El Edrisi a tradition of an island in the Atlantic, called Laca, off the north-west coast of Africa, having been formerly inhabited, but abandoned on account of the excessive multiplication of serpents on it. According to Scaligerus, the mountains dividing the kingdom of Narsinga from Malabar produce many wild beasts, among which may be enumerated winged dragons, who are able to destroy any one approaching their breath. Megasthenes (_tradente Æliano_) relates that winged serpents are found in India; where it is stated that they are noxious, fly only by night, and that contact with their urine destroys portions of animals. Ammianus Marcellinus (who wrote about the fourth century A.D.) states that the ibis is one among the countless varieties of the birds of Egypt, sacred, amiable, and valuable as storing up the eggs of serpents in his nest for food and so diminishing their number. He also refers to their encountering flocks of winged snakes, coming laden with poison from the marshes of Arabia, and overcoming them in the air, and devouring them before they quit their own region. And Strabo,[192] in his geographical description of India, speaks of serpents of two cubits in length, with membraneous wings like bats: "They fly at night, and let fall drops of urine or sweat, which occasions the skins of persons who are not on their guard to putrefy." Isaiah speaks of fiery flying serpents, the term "fiery" being otherwise rendered in the Alexandrine edition of the Septuagint by θανατοῦντες "deadly," while the term "fiery" is explained by other authorities as referring to the burning sensation produced by the bite, and to the bright colour of the serpents.[193] Collateral evidence of the belief in winged serpents is afforded by incidental allusions to them in the classics. Thus Virgil alludes to snakes with strident wings in the line Illa autem attolit stridentis anguibus alis.[194]