Two static representations of the beef network in Scotland. (a) each point represents a movement (of at least two animals) between a pair of farms. Farms are indexed via their CPH number (county, parish, holding). The higher density squares along the diagonal indicate within county movements. The higher density to the left of the plot indicates greater movement of animals into the lowest indexed county (Aberdeenshire) (b) distribution of on (circles) and off (crosses) movements from the farms. Both follow scale-free distributions with exponents 2.2 and 2.7 respectively .