Research questions:

​

1. Many different rugs can be distinguished in the field: can there be a dominace order in this?

​

2. How does body weight change during the year in relation to sex, breeding time, moulting period and fat build-up?

​

3. Are age characteristiccs in the field consistent with those obtained at autopsy?

​

4. How is the flight feather moult timed against other energy demanding processes such as brooding and winter cold?

​

5. Is ther a difference in moulting time between 1st year and older birds?

​

6. Is the relationship between body weight and pectoral muscle weigh constant?

​

7. Is there a correlation between weight, wing length, tail length, head length, beak length and walking leg genth?

​

8. What is the difference between walking leg length (including skin) and bone length?

​

9. Do the external dimensions of the crop give a reasonable reflection of the amount of filling?