Table 1. Mean (±SD) values for structural dimensions of thirteen Bullfinch nests.
Wall thickness is the average of all 4 sides measured.
| Variable | Mean ± SD | Coefficient of variation (%) |
|---|---|---|
| Nest diameter parallel to long axis (mm) | 131.0 ± 25.6 | 20 |
| Nest diameter perpendicular to long axis (mm) | 118.4 ± 20.7 | 18 |
| Ratio of nest diameters | 1.1 ± 0.2 | 18 |
| Cup diameter parallel to long axis (mm) | 82.2 ± 12.3 | 15 |
| Cup diameter perpendicular to long axis (mm) | 67.3 ± 7.6 | 11 |
| Ratio of cup diameters | 1.2 ± 1.3 | 108 |
| Outer wall thickness (mm) (calculated) | 22.1 ± 9.3 | 42 |
| Cup wall thickness (mm) | 6.2 ± 1.6 | 26 |
| Total upper wall thickness (mm) (calculated) | 24.6 ± 10.7 | 44 |
| Base wall thickness (outer nest and cup wall at base) (mm) (calculated) | 26.4 ± 11.1 | 42 |
| Nest height (mm) | 49.7 ± 11.4 | 23 |
| Maximum cup depth (mm) | 23.3 ± 4.5 | 19 |
| Total nest mass (g) | 14.7 ± 5.0 | 34 |
| Outer wall base mass (g) | 10.3 ± 4.8 | 47 |
| Outer wall top mass (g) | 1.2 ± 0.7 | 58 |
| Outer wall top mass parallel to long axis (g) | 0.5 ± 0.4 | 80 |
| Outer wall top mass perpendicular to long axis (g) | 0.6 ± 0.3 | 50 |
| Total outer wall mass (g) | 11.5 ± 5.3 | 46 |
| Cup wall mass (g) | 3.2 ± 1.2 | 38 |
| Cup volume (cm3) | 49.6 ± 13.1 | 26 |