Measured parameters
| Group . | No. . | Parameter . | Description . |
|---|---|---|---|
| Gape | 1 | Gape 1 | Maximum gape during the approach |
| 2 | Gape 2 | Maximum gape during `Catch and Throw' | |
| 3 | Gape level | Mean gape between Gape 1 and 2 | |
| 4 | Gape level s.d. | Standard deviation of no. 3 (indicator for repositioning) | |
| 5 | Gape period | Time between Gape 1 and 2 | |
| 6 | Gape 2 Moment | Time from start to Gape 2 | |
| Lower bill | 7 | Lower bill 1 | Maximum depression of the lower bill during the approach |
| 8 | Lower bill 2 | Maximum depression of the lower bill during the `Catch and Throw' | |
| 9 | Lower bill level | Mean depression of the lower bill between Lower bill 1 and 2 | |
| 10 | Lower bill s.d. | Standard deviation of no. 9 (indicator for repositioning) | |
| 11 | Lower bill period | Time between lower bill 1 and 2 | |
| 12 | Lower bill 2 moment | Time from start to lower bill 2 | |
| Prokinesis | 13 | Prokinesis at Gape 1 | Angle around nasal—frontal hinge at Gape 1 |
| 14 | Prokinesis at Gape 2 | Angle around nasal—frontal hinge at Gape 2 | |
| 15 | Prokinesis level | Mean angle around nasal—frontal hinge between Gape 1 and Gape 2 | |
| 16 | Prokinesis level s.d. | Standard deviation of no. 15 (indicator for constancy of kinesis) | |
| Rhynchokinesis | 17 | Rhynchokinesis at Gape 1 | Angle around bending zone in the upper bill at Gape 1 |
| 18 | Rhynchokinesis at Gape 2 | Angle around bending zone in the upper bill at Gape 2 | |
| 19 | Rhynchokinesis level | Mean angle around bending zone in the upper bill between the moment of Gape 1 and Gape 2 | |
| 20 | Rhynchokinesis level s.d. | Standard deviation of no. 19 (indicator for constancy of kinesis) | |
| Food | 21 | Food level | Mean distance between the cranium and the food-item between the moment of grasping and swallowing |
| 22 | Food level s.d. | Standard deviation of no. 21 (indicator for inter-oral transport other than`Catch and Throw') | |
| 23 | Food period | Duration of holding the food item | |
| 24 | Food min moment | Moment of release of the food item in the `Catch and Throw' | |
| Head Y | 25 | Head elevation period | Time between minimum and maximum elevation of the head |
| 26 | Difference head elevation | Maximum distance of head elevation | |
| 27 | Max head elevation moment | Moment of maximal head elevation | |
| Head X | 28 | Head X period | Time between minimum and maximum horizontal displacement of the head |
| 29 | Difference head X | Maximum distance of horizontal head displacement | |
| 30 | Min head X moment | Moment of minimal horizontal extension of the neck (head closest to the body) | |
| Neck | 31 | Neck neck period | Time between maximal and minimal flexion of the neck |
| 32 | Difference neck neck | Difference in angle between maximal and minimal flexion | |
| 33 | Neck neck moment | Moment of minimum neck flexion | |
| Throat | 34 | Throat period | Period between minimum and maximum throat depression |
| 35 | Difference throat | Distance between minimum and maximum throat depression | |
| 36 | Throat moment | Moment of maximum throat depression |
| Group . | No. . | Parameter . | Description . |
|---|---|---|---|
| Gape | 1 | Gape 1 | Maximum gape during the approach |
| 2 | Gape 2 | Maximum gape during `Catch and Throw' | |
| 3 | Gape level | Mean gape between Gape 1 and 2 | |
| 4 | Gape level s.d. | Standard deviation of no. 3 (indicator for repositioning) | |
| 5 | Gape period | Time between Gape 1 and 2 | |
| 6 | Gape 2 Moment | Time from start to Gape 2 | |
| Lower bill | 7 | Lower bill 1 | Maximum depression of the lower bill during the approach |
| 8 | Lower bill 2 | Maximum depression of the lower bill during the `Catch and Throw' | |
| 9 | Lower bill level | Mean depression of the lower bill between Lower bill 1 and 2 | |
| 10 | Lower bill s.d. | Standard deviation of no. 9 (indicator for repositioning) | |
| 11 | Lower bill period | Time between lower bill 1 and 2 | |
| 12 | Lower bill 2 moment | Time from start to lower bill 2 | |
| Prokinesis | 13 | Prokinesis at Gape 1 | Angle around nasal—frontal hinge at Gape 1 |
| 14 | Prokinesis at Gape 2 | Angle around nasal—frontal hinge at Gape 2 | |
| 15 | Prokinesis level | Mean angle around nasal—frontal hinge between Gape 1 and Gape 2 | |
| 16 | Prokinesis level s.d. | Standard deviation of no. 15 (indicator for constancy of kinesis) | |
| Rhynchokinesis | 17 | Rhynchokinesis at Gape 1 | Angle around bending zone in the upper bill at Gape 1 |
| 18 | Rhynchokinesis at Gape 2 | Angle around bending zone in the upper bill at Gape 2 | |
| 19 | Rhynchokinesis level | Mean angle around bending zone in the upper bill between the moment of Gape 1 and Gape 2 | |
| 20 | Rhynchokinesis level s.d. | Standard deviation of no. 19 (indicator for constancy of kinesis) | |
| Food | 21 | Food level | Mean distance between the cranium and the food-item between the moment of grasping and swallowing |
| 22 | Food level s.d. | Standard deviation of no. 21 (indicator for inter-oral transport other than`Catch and Throw') | |
| 23 | Food period | Duration of holding the food item | |
| 24 | Food min moment | Moment of release of the food item in the `Catch and Throw' | |
| Head Y | 25 | Head elevation period | Time between minimum and maximum elevation of the head |
| 26 | Difference head elevation | Maximum distance of head elevation | |
| 27 | Max head elevation moment | Moment of maximal head elevation | |
| Head X | 28 | Head X period | Time between minimum and maximum horizontal displacement of the head |
| 29 | Difference head X | Maximum distance of horizontal head displacement | |
| 30 | Min head X moment | Moment of minimal horizontal extension of the neck (head closest to the body) | |
| Neck | 31 | Neck neck period | Time between maximal and minimal flexion of the neck |
| 32 | Difference neck neck | Difference in angle between maximal and minimal flexion | |
| 33 | Neck neck moment | Moment of minimum neck flexion | |
| Throat | 34 | Throat period | Period between minimum and maximum throat depression |
| 35 | Difference throat | Distance between minimum and maximum throat depression | |
| 36 | Throat moment | Moment of maximum throat depression |