How Dinosaurs Detect You

Fossil Force dinosaurs detect you primarily by sound and secondarily by sight — which means your own noise is the main danger in every run. The developer's stated goal is that you feel hunted by a living animal rather than fighting a monster, and the detection model reflects that: threats are locatable, predictable and avoidable if you understand what triggers them. This page breaks down how detection works, the five-state behavior loop every dinosaur follows, and the noise habits that keep you off the menu. To act on this knowledge, pair it with the dinosaur audio survival guide.

The two sensors: hearing first, sight second

• Hearing is the primary sensor. Sprinting, firing a weapon, and rattling loot around all raise your audio signature. A dinosaur reacts to noise long before it ever sees you.
• Sight is the secondary sensor. Being visible mostly matters when you are already close or already loud — which is why line-of-sight management becomes critical once a dinosaur is alerted.
• Biome ambience cuts both ways. Jungle birds and insects mask your noise, but they also mask dinosaur cues. Tundra wind does the same over longer distances. The ambience never makes you silent.

The practical consequence: in most encounters you are detected because of something you did — a sprint across open ground, an unnecessary gunshot — not because a dinosaur was camped on your position.

The five-state behavior loop

Dinosaur behavior follows a readable five-state cycle. Reading which state a nearby dinosaur is in tells you what to do next:

1. Idle / Patrol — the dinosaur moves along its own business. This is your window to move, loot and route-plan. Stay quiet and you never need to engage.
2. Alert — a cue caught its attention. Audio cues intensify, posture changes, and it orients toward the sound. Stop noise-making actions immediately and watch where its attention points.
3. Investigate — it moves toward the disturbance to check. Hold still or back away quietly. If it finds nothing, it returns to patrol.
4. Commit (chase) — it has located you and pursues. This is the only state where escaping matters more than everything else — follow the chase playbook.
5. Lose / Reset — it loses track of you and gives up. The encounter ends when you break pursuit and stay quiet; the alert level decays back to patrol.

The loop's lesson is the game's core skill: reset, don't fight. Extraction almost always beats engagement in a PvE game.

What raises your audio signature

• Sprinting — the single most common self-inflicted detection trigger.
• Gunshots — a shot is a dinner bell for everything nearby, so weapons stay a last resort (see the weapon tier list).
• Careless looting and bumping terrain at speed.
• Moving through quiet zones — the tundra's calm makes every footstep proportionally louder against the baseline.

Perks interact with this model directly: Quiet Step attacks the "being heard" half and Keen Hearing attacks the "hearing them" half, which is why they top the best perks ranking.

What is confirmed vs to be confirmed

Confirmed: the hearing-first detection model, the presence-before-contact design philosophy, and the five-state behavior loop. To be confirmed: dinosaur species names, stats, exact detection radii and whether visual indicators appear in the UI. We will update this page with in-game data after launch.