Table 1.
Summary table including numbers of solves and percentages of birds solving at the subpopulation level across the three experimental stages.
| BB | CP | GW | MA | MP | BO | |
|---|---|---|---|---|---|---|
| dial diffusion (single-step task) | ||||||
| (i) % birds solving the one-step task | 34.7 | 29.2 | 12.9 | 10.7 | — | 9.5 |
| (ii) no. solves of the one-step task | 5340 | 8522 | 2646 | 1607 | — | 306 |
| (iii) bias towards demonstrator solution (side) in the one-step task | 0.34 | 0.94 | 0.99 | 0.75 | — | NA |
| complex first generation experiment (progressively rewarded two-step task) | ||||||
| (iv) % birds solving the one-step component(s) | 16.7 | 22.1 | 16.7 | 13.6 | 10.5 | 11.8 |
| (v) no. solves of one-step components | 4546 | 7400 | 1706 | 1680 | 1804 | 352 |
| (vi) % birds solving the full two-step task | 8.9 | 10.3 | 2.9 | 2.1 | 6.7 | 0 |
| (vii) no. solves of the full two-step task | 1219 | 1815 | 182 | 58 | 51 | 1 |
| complex second generation experiment (two-step task with only full solves rewarded) | ||||||
| (viii) no. birds present in second year that were two-step solvers in the first generation | 13 | 3 | 1 | 0 | — | — |
| (ix) % naïve birds solving the (unrewarded) one-step component(s) | 4.9 | 9.8 | 7.6 | 9.8 | — | — |
| (x) no. solves of one-step components | 2148 | 2105 | 482 | 164 | — | — |
| (xii) % naïve birds solving the full two-step task | 18.0 | 7.8 | 4.5 | 0.0 | — | — |
| (xiii) no. solves of the two-step task | 2164 | 2124 | 484 | 0 | — | — |