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In South America, a burrowing rodent, the tuco-tuco, or Ctenomys, is even more subterranean in its habits than the mole; and I was assured by a Spaniard, who had often caught them, that they were frequently blind; one which I kept alive was certainly in this condition, the cause, as appeared on dissection, having been inflammation of the nictitating membrane.
"No, but phosphorescent insects, positive glow-worms, living diamonds, which the ladies of Buenos Ayres convert into magnificent ornaments." "What!" exclaimed Robert, "those sparks flying about are insects!" "Yes, my boy." Robert caught one in his hand, and found Paganel was right. It was a kind of large drone, an inch long, and the Indians call it "tuco-tuco."
This state of the eyes is probably due to gradual reduction from disuse, but aided perhaps by natural selection. In South America, a burrowing rodent, the tuco-tuco, or Ctenomys, is even more subterranean in its habits than the mole; and I was assured by a Spaniard, who had often caught them, that they were frequently blind.
The other opossum is the black and white Didelphys azarae; and it is indeed strange to find this animal on the pampas, although its presence there is not so mysterious as that of the tuco-tuco. It shuffles along slowly and awkwardly on the ground, but is a great traveller nevertheless.
A more interesting animal is the Ctenomys magellanica, a little less than the rat in size, with a shorter tail, pale grey fur, and red incisors. It is called tuco-tuco from its voice, and oculto from its habits; for it is a dweller underground, and requires a loose, sandy soil in which, like the mole, it may swim beneath the surface.
In South America, a burrowing rodent, the tuco-tuco, or Ctenomys, is even more subterranean in its habits than the mole; and I was assured by a Spaniard, who had often caught them, that they were frequently blind; one which I kept alive was certainly in this condition, the cause, as appeared on dissection, having been inflammation of the nictitating membrane.
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