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Memory performance by migratory Zonotrichia leucophrys gambelii (black bars) and non-migratory Z. l. nuttalli (hatched bars) on a one-trial associative learning task. (a) Spatial task with five feeders; and (b) spatial and non-spatial (colour) tasks with eight feeders. A lower number of sites inspected prior to finding the correct feeder indicates better memory performance.
