Trail Camera Population Estimate (Jacobson Method)
The published Jacobson/Severinghaus camera-survey method used by wildlife biologists and extension services.
How this works
This is the published camera-survey method used by wildlife biologists and many state and university extension programs: since bucks are individually identifiable by their antlers but does and fawns generally aren't, the ratio of total deer photos to total buck photos — combined with how many individual bucks you can identify — lets you estimate the total herd size on your property.
Running a good survey
The method assumes decent camera coverage over enough time to photograph most of the resident deer more than once, typically a pre-rut window of two to three weeks with cameras at bait or mineral sites. A too-short survey or too few cameras will bias the estimate; more unique bucks identified and more total photos both improve confidence in the result.
Frequently asked questions
How many photos do I need for a reliable estimate?
More is better — the Jacobson method gets more reliable with a larger total photo count, so a short two-week survey with few photos will swing more than a full pre-rut survey with thousands of images.
Why does this need buck photos specifically instead of just deer photos?
Bucks are individually identifiable by their antlers in a way does and fawns generally aren't, so the ratio of total deer photos to buck photos — combined with how many individual bucks you recognize — is what makes the population estimate possible.
What's a good survey window for this method?
A pre-rut window of roughly two to three weeks with cameras placed at bait or mineral sites is the typical setup extension programs recommend for getting enough repeat photos of the resident herd.
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