Table 1. Characteristics of the ten experimental feeders.
| Feeder | Temperature (°C) | Light intensity (lux) | Distance to cover (m) | Recording time (h:min) | Foraging time (s /10 h) | Visits to feeders (#/10 h) | # Species | # Individuals |
| 1 | 4.8 | 781 | 0.1 | 44:05 | 772 | 18 | 5 | 22 |
| 2 | 4.5 | 299 | 0.3 | 42:11 | 1769 | 26 | 5 | 23 |
| 3 | 7.9 | 6645 | 0.3 | 46:11 | 3814 | 64 | 5 | 40 |
| 4 | 6.7 | 3685 | 0.3 | 53:26 | 916 | 17 | 5 | 24 |
| 5 | 5.9 | 2790 | 0.4 | 36:55 | 2997 | 56 | 5 | 35 |
| 6 | 5.7 | 2963 | 0.4 | 37:03 | 591 | 16 | 5 | 25 |
| 7 | 6.3 | 2453 | 3.2 | 41:07 | 1156 | 24 | 5 | 27 |
| 8 | 8.2 | 9910 | 3.4 | 26:17 | 306 | 6 | 3 | 11 |
| 9 | 5.6 | 2720 | 4.0 | 23:22 | 242 | 5 | 1 | 6 |
| 10 | 5.2 | 1000 | 6.5 | 26:24 | 116 | 5 | 3 | 4 |
Temperature and light intensity refer to those registered during the 14 sampling days. The dashed line divides feeders included in ‘near’ and ‘far’ categories. Feeding time and visits to feeders are cumulative numbers for all 38 birds, measured in seconds of feeder use and number of visits per 10 hours of recording time, respectively.