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Schematic of feeders used in A) Experiments 1 and 3, and B) Experiment 2, show C) weak scent cue: mesh-covered dish holding herbs or spice, D) metal food dish, E) strong shape cue: flower pot, F) strong scent cue: mesh-covered test tube holding strong liquid scent, G) weak shape cue: flat pattern of pipe cleaners on cage wall.
