Rats are as bad as human beings in some ways. In the latest Journal of Wildlife Management, Dr. John B. Calhoun, of Johns Hopkins, discusses one such aspect of the rat world: the troubles which refugee rats have to put up with when they emigrate.
Dr. Calhoun took a rat census of several adjoining blocks in Baltimore, and trapped and marked many of the native-son rats. Then he released 112 marked alien rats in the center of the middle block. At once there was social strife. Both native rats and aliens scurried around wildly, invading backyards where none had been seen before....
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