Overview
- The peer‑reviewed paper, published Wednesday in Current Biology, compared 2020–2025 crash records with long‑term field data and found areas heavily used by mountain lions had as much as a 76 percent drop in collisions with deer.
- The effect came mostly from changed deer behavior: deer were 15 percent less likely to use road‑dense areas, 86 percent more likely to occupy remote forest, and shifted toward daytime activity rather than a fall in deer numbers from predation.
- The analysis used 503 camera traps and GPS data from 59 collared pumas collected by a Panthera program run with tribal partners, which let researchers link predator presence to where and when deer moved.
- Authors note limits: the study sampled summer behavior only, cannot yet back‑calculate the exact number of human deaths or injuries avoided, and traffic on the peninsula is relatively light compared with some regions.
- Conservationists say the findings offer a tangible safety and economic argument for living with cougars, but researchers warn state lethal removals of pumas remain a major threat to sustaining those benefits.