| Food was delivered in a wash bottle to train test subjects to investigate surface disturbance. |
| If the problem persists it is a good idea to keep a record of the frequency and type of disturbance. |
| The 1850 event corresponds with the date of two intense windstorms and was the only disturbance event large enough to recruit white pine. |
| If endoscopy shows no obvious abnormality a diagnosis of a primary motility disturbance of the oesophagus such as achalasia should be considered. |
| Mrs Cook added that horses have acute hearing and can often hear a helicopter, and sense a disturbance in the air, from miles away. |
| Cold weather, a lack of food or disturbance can however cause wintering birds to seek new sites. |
