SILVER-FOX FARMING. 
NEST BOXES. 
27 
The nest box is the home of the pups and the mother for some 
time, and should be large enough to prevent crowding, but small 
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Fig. 30. — Simple type of aboveground den. 
enough to keep the occupants warm by their own body heat. A good 
size is 22 inches long, 18 inches wide, and 20 inches high. The en- 
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trance is 8 inches square and is not cen- 
tered, but placed to one side to keep 
drafts from striking the pups. Cham- 
fered strips placed on the floor at the 
corners prevent the pups from creep- 
ing too far awav from the mother. 
(Fig. 33.) 
The nest box should be fastened in 
the den in some temporary manner, by 
hook and eye or slat boards, as it is im- 
portant to be able to remove it for cleaning and during the summer, 
when not needed. It should have a hinged cover or removable top 
IB* 
Fig. 31. — Underground den. 
