Calculated parameters used in the kinematic analysis
| No. . | Parameter . | Description . |
|---|---|---|
| 1 | Standard measure | Measured on the reference grid (mm) |
| 2 | Gape | Distance between upper and lower bill tip (mm) |
| 3 | Distance food | Distance between the food item and the upper bill tip (mm) |
| 4 | X position head | Relative horizontal position of the head (ear) (mm) |
| 5 | Y position head | Elevation of the head (ear) above the ground (mm) |
| 6 | Flexion in nasal—frontal hinge | Angle between cranium and caudal part of the upper bill (deg.) |
| 7 | Flexion halfway the upper bill | Angle between the caudal and rostral part of the bill (deg.) |
| 8 | Opening lower bill | Angle between the cranium and lower bill (deg.) |
| 9 | Depression of the throat | Distance between the cranium (ear) and oropharynx floor near the larynx (mm) |
| No. . | Parameter . | Description . |
|---|---|---|
| 1 | Standard measure | Measured on the reference grid (mm) |
| 2 | Gape | Distance between upper and lower bill tip (mm) |
| 3 | Distance food | Distance between the food item and the upper bill tip (mm) |
| 4 | X position head | Relative horizontal position of the head (ear) (mm) |
| 5 | Y position head | Elevation of the head (ear) above the ground (mm) |
| 6 | Flexion in nasal—frontal hinge | Angle between cranium and caudal part of the upper bill (deg.) |
| 7 | Flexion halfway the upper bill | Angle between the caudal and rostral part of the bill (deg.) |
| 8 | Opening lower bill | Angle between the cranium and lower bill (deg.) |
| 9 | Depression of the throat | Distance between the cranium (ear) and oropharynx floor near the larynx (mm) |