Where the data comes from
HuntTrack queries the iNaturalist observations API for records inside Idaho carrying the Alive/Dead annotation set to Dead. That single flag is the closest thing to a nationwide, daily-updated roadkill feed that anyone can use without a data-sharing agreement.
Observer bias in one sentence
Every point on the map required a person with a phone. Highway corridors, trailheads and towns are over-represented; roadless country is nearly blank. Absence of points is not absence of animals.
How to read a cluster
Look for repeat kills at the same road bend across multiple years and seasons. That repetition is the signal — a crossing that animals use habitually, usually a drainage, saddle or fence gap funnelling movement across the road.