Fast learning of hooded rats in water maze. A) Success rates of rats and tree shrews on each training day. Rats showed significantly higher success rates than tree shrews (paired t-test, t(5) = 4.423, P = 0.007). B) Water maze learning curves (mean ± SEM) during training for both species. Rats found the PF significantly faster than tree shrews, reflected by both escape latency (top) and escape distance (bottom; 2-way ANOVA for repeated measures, 23 animals, escape latency: species: F(1) = 41.544, P < 0.001, η² = 0.664; training day: F(5) = 20.489, P < 0.001, η² = 0.494; training day × species: F(1, 5) = 4.207, P = 0.002, η² = 0.167; escape distance: species: F(1) = 40.543, P < 0.001, η² = 0.659; training day: F(5) = 15.136, P < 0.001, η² = 0.419; training day × species: F(1, 5) = 3.301, P = 0.008, η² = 0.136).