EvoSim — Natural Selection Beetle Lab
✅ Quick Start (students can figure it out)
1) Pick an environment • 2) Click Start New Run • 3) Click Auto Run (or Step) • after ~8 generations, change the environment and watch the graph.

EvoSim

Natural Selection Beetle Lab • simulate populations, predators, and environmental change

🧬 Generation: 0
🪲 Population: 0
🐦 Predation: —

🧪 Lab Controls

Use the Quick Start bar above. Keep “Advanced” closed unless you want to change mutation/cap/speed.

30% of population targeted
Do this: Pick an environment → click Start New Run → click Auto Run.
Recommended: 60–120 for smooth results.
50% green • 50% brown
3% per offspring
Population stabilizes near this number.
650 ms / generation
CER idea: Switch environments mid-run and use the graph + log as Evidence.
Environment: —
Green: —
Brown: —
Eaten: —
Survivors: —

📈 Trait Frequency (last 20 generations)

Tip: Run ~8 generations, then change environment. Watch the lines shift.

🧾 Generation Log

Gen Env Green% Brown% Eaten
Prompt: Predict what happens if predation increases, then test it.