Beaver Set using Castor
Above photo shows the last step in making a beaver castor set with beaver gland lure placed at waters edge for maximum attraction at a castor set for beaver.  (Note: Small area of expanding oily film lying on top of the water.)

This photo shows a completed castor set in its entirety, lure at bottom center with Beaver Comstock Cage Trap covered at top center.  Lure is shown with oily film on the surface and Comstock Beaver Cage submerged above, well hidden  under grass in the narrowed area created with logs on both sides of the opening.  This set was made on the edge of pond where a small channel and crawl out existed.  These sets can be placed virtually anywhere where there is either a natural or man made narrowing.  The cage traps are generally set in just over a foot of water, though a few inches deeper or shallower will not detract from the effectiveness.  A distinct advantage to this type of trapping is that there is no sign left for trappers or anyone to find and there are few limitations in where it can be made.  There is no wire, no stabilizing sticks or focal point for passers by to discern.  In a cage, even the catch is out of sight.  Unlike guillotine door cage traps with doors that protrude well above the trap in plain sight for all to see, this trap with power hinged doors that remain under waster, can be set in high traffic areas, completely undetectable.