Latency to solve the two-step task during the training phase and memory tests. Dots represent the latency for each individual to perform the two-steps during the three last trials of the learning phase (T1 = third-to-last trial (first successful trial); T2 = second-to-last trial (second successful trial); T3 = last trial (third successful trial)) and the two memory tests (M1 = first memory test after 26–33 days of retention; M2 = second memory test after 281–311 days of retention). Lines show repeated measures of the same individual across tests. Large black squares indicate the mean latency for each test. Latencies differed between T1 and T2, but not between T2 and T3, T3 and M1 or M1 and M2 (Linear mixed effects models).