Figure 4.

Different aspects of foraging success for each bird in the variable and constant groups after the emergence of well-type preference. Top pair of charts: foraging success of the variable (A) and constant (B) group. Middle pair: the proportion of time spent at seed-containing wells for the variable (C) and constant (D) group. Bottom pair: the absolute time spent in wells for the variable (E) and constant (F) group. Striped [////] green bars: joining events to profitable variable wells; striped [\\\\] green bars: secondary searching events to profitable variable wells; plain green bars: searching events to profitable variable wells; plain yellow bars: successful visits to constant wells; plain white bars: visits to empty wells (relevant only for panels E and F and includes visits to empty variable wells or to previously visited constant wells).