458 Yearbook of the Department of Agriculture, 1919. 



slivers, to patented products of factories. Although certain 

 styles of traps may be used for catching many different kinds 

 of animals, others are used exclusively for a single species 

 having peculiar habits which make ordinary traps inef- 

 fective. The assortment of traps here illustrated, while by 

 no means complete, is sufficient for capturing all of the ani- 

 mals included within the limits of this article. 



Fig. G. — Cat Trap Designed by the Biological Survey tor Catching 

 Vagrant Cats and Disposing of Them Humanely. 

 Construction and operation are shown in figure 7. 



Steel traps (figs. 12 and 13) and other traps likely to be 

 carried away by the animals caught in them are either 

 chained fast to a stake or other immovable object or attached 

 to a grapple or clog which yields when the captured animals 

 make their first frantic efforts to escape, but which can not 

 be dragged far. A sapling makes an excellent drag, the 

 chain being attached 2 or 3 feet from the larger end, which 

 makes it move more or less crosswise and soon become 

 fastened in bushes or weeds. Trap chains should always in- 

 clude a swivel. 



