Figure 1.

Schematic diagram of the eviction experiment. (a) Focal groups consisted of a breeding pair (R1 and R2) and at least one non-breeding subordinate (R3). The rank 3 individual was removed from the focal group, and a size-matched rank 3 (R3′) and rank 2 (R2′) from other groups were introduced to the focal group one at a time, on separate days and in random order. (b) After 1 day, the introduced individual was scored as either evicted or not evicted. The individual was considered not evicted if it spent the majority of the 5 min observation period among the anemone's tentacles. The individual was considered evicted if it was either not present, or spent the majority of the 5 min observation outside of the anemone's tentacles.