Figure 2. Percentage of new neuronal recruitment into the hippocampus (HC) and nidopallium caudolateral (NCL) of reed warbler (Acrocephalus scirpaceus), as a function of their migration distances from wintering grounds in Africa to Israel.

For the HC, Spearman’s rank correlation, P = 0.12; ρ = 0.69 (N = 6), and for NCL P = 0.8; ρ = −0.13 (N = 6).