Table 1. Syncitial barbule fibre angles in the rachidial cortex on either side of the midline as they diverge to the barbs.
| species | Number of | Fibre angle | Std. Dev. |
|---|---|---|---|
| Measurements n | Mean | ||
| Falco tinnunculus | 8 | 79.7 | 2.36 |
| Cygnus olor | 12 | 76.7 | 3.8 |
| Falco peregrinus | 11 | 79.9 | 1.7 |
| Gallus gallus | |||
| i) Fresh, hand cut | 15 | 82.1 | 1.95 |
| ii) biodegraded | 10 | 80.2 | 4.8 |
| Circus ranivorus | 8 | 78.2 | 4.75 |
| Polihierax semitorquatus | 10 | 81.7 | 4.82 |
| Aquila verreauxii | |||
| i) 40% rachis L | 8 | 75.66 | 6.35 |
| ii)3/4 length | 8 | 79.7 | 2.793 |
| iii) 7/8 length | 12 | 82 | 2.92 |
| Threskiornis aethiopicus | 12 | 77.3 | 3.91 |
| Aquila verreauxii, mid-length 50% | 9 | 78.9 | 4.7 |
| Eudocimus ruber | 11 | 78.41 | 2.52 |
Ninety degrees equals the longitudinal axis.