... often noticed. Take a farm, or any place where there are many Rats, and it will be always found that when a Rat gets very old it becomes very greyish in colour and rather scabbed, and its hair comes off, mostly on the back. The healthy Rats will then drive the old Rat away, and these scabby old Rats may be caught by themselves in other parts of the buildings; and, further, I often notice that if the ferrets are bitten with these old Rats, they "take bad ... — Full Revelations of a Professional Rat-catcher - After 25 Years' Experience • Ike Matthews
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