Fig. 2.

Experimental design. Gray indicates enclosures in which 67% of the offspring were released with their mother (i.e., populations of high kin competition), whereas black indicates enclosures in which 33% of the offspring were released with their mother (i.e., populations of low kin competition). White indicates enclosures that were initially empty. Pitfall traps at the end of each one-way corridor are represented in black. (Scale bar, 20 m.)