This left a total of 22 individuals out of the original 27 to be included in the linear model and 8 flocks out of 9 in the flock-level comparisons.
All the birds were male and the majority 20 out of 27 were in their first winter age was scored according to.
After 1500 h, there was little or no foraging activity as daylight started to wane but mealworms at the balance were still attractive.