Fig. 2. Random nest distribution of mole-rats under corneal anaesthesia. Triangles indicate mean nesting directions of the repeatedly tested six pairs in control (A) and under anaesthesia (B), and nesting directions of the singular tested group in control (C; N=42) and treatments (D; N=40). The arrows, proportional to the outside radius (=1), mark the grand mean vector based on the pairs' mean directions (A,B) or the mean vector of all single decisions (C,D). The inner circles mark the Rayleigh significance thresholds: 5% (broken) and 1% (solid) in A, B; 1% (broken) and 0.1% (solid) in C, D. Table 1 gives numerical values.