Clark's nutcrackers, Nucifraga columbiana, pinyon jays, Gymnorhinus cyanocephalus, scub- jays, Aphelocoma coerulescens, and Maxican jays, A. Ultramarina, differ in their dependence on cached seeds in their natural environments. The hypothesis that these species differ in their long-term ability to remember the locations of caches was tested in the laboratory. Birds recovered caches 10, 60, 150 and 250 days after making them. All species performed at levels better than chance overall, but scurb-jays and Mexican jays performed with modest accuracy at all time intervals.
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