Research overview: the science of trail-based versus random camera placement

Where cameras are placed, on trails, roads, and game paths that funnel animal movement, or at random or systematic points representing the landscape, fundamentally shapes the data and the inferences it supports. This overview synthesizes the trade-offs: targeted placement on travel routes boosts captures of trail-using carnivores and aids individual identification but biases relative abundance and violates the independence assumptions of some density and occupancy models, while random placement better represents habitat use but yields sparser data. It discusses how the right choice depends on study objectives, whether estimating density, occupancy, community composition, or simply photographing elusive cats, and how mismatched placement and analysis lead to error. Placement strategy is among the most consequential design decisions in camera trapping.