Fig. 2
From: Behavioural plasticity and the transition to order in jackdaw flocks
Three representative mobbing flocks showing increasing group order with group density. a Flock at low density (ρ = 0.002 m−3). b Flock at moderate density (ρ = 0.008 m−3). c Flock at high density (ρ = 0.014 m−3). d Instantaneous group order ϕt for the flocks shown in (a–c). For a, c the meanings of the coloured lines, black dots, and grey planes are same as those shown Fig. 1
