Mistle thrushes are larger and greyer than song thrushes. They have round black spots on their pale breasts, a white tail edge and white under wing.
They are also shyer than song thrushes, except when nesting when they can be aggressive and will make loud, dry, rattling calls. If they are disturbed they will fly off high up and for long distances.
In all weathers they can be heard singing loudly from the tops of trees and like robins, they are one of the few birds you are likely to hear singing on Christmas day. Mistle thrushes are sometimes called stormcocks due to their tendency to defend their territories from tall trees even in the most dreadful weather.
Mistle thrushes eat worms, slugs, insects and berries and although mistletoe berries are an important source of food in Europe, in the UK they are more likely to feed on holly and hawthorn berries.
They are less likely to come in to gardens than song thrushes but if they weather is cold you may see one searching for windfall apples.