Figure 2
From: Innovative composite tool use by Goffin’s cockatoos (Cacatua goffiniana)
Progress until reaching criterion or completing the minimum number of sessions, for the 3 solvers: (A) Figaro, (B) Fini, and (C) Pipin. Colors: black (failed due to reaching the time limit), grey (failed due to inactivity), yellow (solved by cheating), and blue (solved). The asterisk marks the criterion point. Y axis, time (seconds); X axis, sessions and trials.
