K. Ullas Karanth and James D. Nichols have produced an 8-part instructional series about monitoring tiger populations.
You can watch it here on You Tube.
The footage and animations are excellent, and three chapters deal with the use of camera traps.
It all builds on the efforts of Karanth and Nichols who have been worked hard over the past 3 decades to introduce science into the business of estimating wild tiger populations.
While few readers of this blog will ever have occasion to use the method, the camera trapping chapters are well worth viewing to appreciate the painstaking effort that goes into wildlife population estimation.
It's not quite as simple or easy as the general public, politicians, and most outdoors folks would like to believe.
But hey, you can trust the results.