Figure 2From: Directional compass preference for landing in water birdsCircular diagrams of the headings of mallards during different stages of the landing approach: (a) arrival (b) preparation (c) landing. The mean vector of each phase is indicated by a double-headed arrow. Each triangle in (a), (b), (c) represents 21, 31, and 27 single measurements, respectively. The inner circle indicates the 5% significance level of the Rayleigh test.Back to article page