Fig. 1. Cornering observed during 20 min of observation. (A) Mean frequency of cornering events in the reflective and non-reflective (matte) environments. Dominant (Dom) and subordinate (Sub) crayfish paired for 30 min cornered more frequently on the mirrored side of the tank. After 3 days of pairing, dominant crayfish cornered more frequently on the reflective side. Group-socialized crayfish also cornered more on the reflective side of the tank compared with the non-reflective side. (B) Mean time each crayfish group spent cornering on the reflective and non-reflective (matte) sides of the test aquarium. After 30 min of pairing, both dominant and subordinate crayfish cornered for a longer time on the mirrored side of the tank, but after 3 days of pairing only dominant crayfish did (paired t-test: ^***P<0.0001, ^**P<0.005, ^*P<0.05; N=20). Error bars depict standard deviation.