Every year as soon as the first snows fall we have a small flock of Fieldfare (Turdus pilaris) and Redwings (Turdus iliacus) visit the area.
The attraction is the aging fruit trees in the gardens to the rear of ours. They are un-pruned, making reaching the top-most fruit difficult, leaving them to fall off during the winter.
Last year the trees suffered from the weather and produced fewer fruits than usual. Consequently there were no flocks only a singleton fieldfare. As there are no apples, it has taken over our 3-4ft tall crab apple, which against the trend was loaded with fruit.
This has led to conflict with the incumbent blackbirds, infact any smaller fruit eating bird that dares to enter the garden.
As I had never noticed this kind of behavior before,I made a the search of the web where on the RSPB forum there were others noting the bully boy tactics and quoting them to be a one bird food barrier.