more normal foodstuffs they browsed on the corrugated-iron roofs of houses. Again the colonists vengefully expected dyspepsia. They digested the roofs, too. Presently the lumbering creatures nibbled at axes—the heads, not the handles. They went on to the plows. When they gathered sluggishly about a ground-car and began to lunch on it, the colonists did not believe. But it was true. 

 The dinies' teeth weren't mere calcium phosphate, like other beasts. An amateur chemist found out that they were an organically deposited boron carbide, which is harder than any other substance but crystallized carbon—diamond. In fact, diny teeth, being organic, seemed to be an especially hard form of boron carbide. Dinies could chew iron. They could masticate steel. They could grind up and swallow anything but tool-steel reinforced with diamond chips. The same amateur chemist worked it out that the surface soil of the planet Eire was deficient in iron and ferrous compounds. The dinies needed iron. They got it. 

 The big dinies were routed by burning torches in the hands of angry colonists. When scorched often enough, their feeble brains gathered the idea that they were unwelcome. They went lumbering away. 

 They were replaced by lesser dinies, approximately the size of kangaroos. They also ate crops. They also hungered for iron. To them steel cables were the equivalent of celery, and they ate iron pipe as if it were spaghetti. The industrial installations of the colony were their special targets. The colonists unlimbered guns. They shot the dinies. Ultimately they seemed to thin out. But once a month was shoot-a-diny day on Eire, and the populace turned out to clear the environs of their city of Tara. 

 Then came the little dinies. Some were as small as two inches in length. Some were larger. All were cute. Colonists' children wanted to make pets of them until it was discovered that miniature they might be, but harmless they were not. Tiny diny-teeth, smaller than the heads of pins, were still authentic boron carbide. Dinies kept as pets cheerily gnawed away wood and got at the nails of which their boxes were made. They ate the nails. 

 Then, being free, they extended their activities. They and their friends tunneled busily through the colonists' houses. They ate nails. They ate screws. They ate bolts, nuts, the nails out of shoes, pocket knives and pants buttons, zippers, wire staples and the tacks out of upholstery. Gnawing even threads and filings of metal away, they made visible gaps in the frames and moving parts of 

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