One of the differences is in the breast marking. The mistle
thrush has round breast markings and the Song Thrush has arrow
shaped markings. The song thrush is also smaller and browner than
the Mistle Thrush.
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There is not a difference between the mistle thrush and the
mizzle thrush. The second spelling is a common misspelling or
colloquialism. This bird is a large, spotted thrush found
throughout Europe.