Sandgrouse Desert Water Flight — 2D Flock Navigation Lab

This 2D companion strips the sandgrouse flight down to the mechanics that decide whether a flock reaches water: a boids model (separation, alignment, cohesion) holds the group together, a gusty crosswind constantly tries to pull individual birds off course, and a navigation-skill parameter determines how strongly each bird corrects back toward the waterhole against that drift. Push wind up and cohesion visibly degrades as birds scatter; push navigation skill up and the flock claws its heading back even in a strong crosswind — the same trade-off real sandgrouse face on long desert water flights, just readable on a flat canvas instead of orbited in 3D.