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J David Ligon
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Dennis J Martin
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Piñon jays (Gymnorhinus cyanocephalus) distinguished accurately between good and bad seeds of piñon pines (Pinus edulis). This was investigated in captives of three age groups: wild-caught adults, hand-reared yearlings, and hand-reared juveniles. All appeared to use visual, tactile (apparently weight) and auditory (‘bill-clicking’) cues. Discrimination improved with practice. Bad seeds weighted with lead shot caused only temporary confusion. Inexperienced piñon jays demonstrated an immediate preference for piñon seeds over other objects. Distinguishing good seeds from bad was learned. ‘Bill-clicking’ apparently is unlearned, as it appears in young birds in a variety of contexts. The relationship between...
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