Jackdaws' behavioural data for experimental stage 4 (mark test).

Behavioural data have been standardized to calculate each value per hour. In each case, the first value shows the number of bouts performed in front of the cardboard and the second those performed in front of the mirror. Data has been calculated, the first number as the mean of the four sessions performed with the non-reflective cardboard, and the second as the mean of the four sessions performed with the mirror. Looks behind the mirror, as the mirror (or the cardboard) is on the wall, involve going to the edge of the mirror and have a lateral look. For information on sex and status (captured in the wild or hand reared in the laboratory) of each individual see Table 1.