In his own words "this book is about animal's incredible ability to vanish in plain sight." He describes the book as interactive because the reader ought to find the hidden critter. The capacity to 'vanish in plain sight' is described here as camouflage, deception, disguise,and trickery...as the lures and decoys employed by the species to avoid predation or to attack without being detected by the potential prey. The description of what biologist would call cryptic behavior or bayesian mechanisms is not described here in scientific terms but instead as powerful visual images.