Predation pressure shapes brain anatomy in the wild.

Repeatability was highly significant over the 5-year period (Lessells and Boag 1987 ): Acara cichlid: r = 0.65, prawns: r = 0.17, pike cichlid: r = 0.43, wolf fish: r = 0.20 (all p < 0.001; Fig. 1 ).

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