Fig. 4.

Giving-up densities (GUD) of seeds on experimental (filled circles) and control (open circles) grids for paired rich (high-density seed) and poor (low-density seed) patches, shown separately for covered (a) and uncovered (b) trays. In both panels, the solid line represents a forager with perfect knowledge that equalizes GUDs across patch quality, and the dotted line represents a forager that forages density-independently (fixed time foraging strategy) and produces GUD ratio that match the starting ratio (2 : 1). The GUD ratio data suggest either a fixed time foraging strategy or a Bayesian foraging strategy (ratios between 2 and 1).