## Characteristics of pellet transport as a function of time.

Transport duration (d), number of carriers involved (n) and the waiting times (w) between transport events are plotted as a function of time (t). **(A)** Time needed for a pellet to be sequentially carried over a distance of 2 m from the excavation site. Solid lines show the results of regression with ln-transformed d-values on both days (first day: d = 0.6·e^{−0.3·t}, *r*^{2} = 0.45, *N* = 60, *P*<0.001; second day: d = 0.4·e^{−0.04·t}, *r*^{2} = 0.05, *N* = 73, *P* = 0.047). **(B)** The number of workers involved in the transport of single pellets. Solid lines show the results of regression with ln-transformed Y-values on both days (first day: n = 6.6·e^{−0.1·t}, *r*^{2} = 0.25, *N* = 60, *P*<0.001; second day: n = 7.9·e^{−0.03·t}, *r*^{2} = 0.06, *N* = 73, *P* = 0.039). **(C)** Time a pellet remained on the floor between two transport events. Solid lines show the results of regression with ln-transformed Y-values on both days (first day: w = 3.8·e^{−0.2·t}, *r*^{2} = 0.10, *N* = 225, *P*<0.001; second day: w = 5.5·e^{−0.1·t}, *r*^{2} = 0.02, *N* = 177, NS).