Abstract We conducted three experiments during May - June,2005,to study the effects of artificial depth of placement, cache spacing,and cache size of sunflower (Helianthus annuus Linn. )seeds on seed discovery by Siberian chipmunks (Tamias sibiricus senescens) in the Dongling Mountains,northwestern Beijing,China. We found that the proportions of seeds discovered were negatively correlated with depth from the soil surface,were extremely low,and but did not differ when seeds were buried at 5 - 8 cm vs. ≥ 10 cm depths. Proportions of seeds discovered were negatiyely correlated with distance between caches,with caches spaced at 1.5 m intervals discovered significantly less often than those spaced more closely together. Proprotions of seeds discovered were positively correlated with cache size,with caches of 1 g found less often than caches of larger size.