Parrot crossbills can get to about 16-18 cm. The juveniles bill is less pronounced and hardly separable from other juvenile crossbills. Parrot crossbills moult between June and November. It's voice tends to be lower, slower and slightly better enunciated than the crossbill. There voice is a 'quop, quop' sound. They are found in pine and spruce forests, and in Britain also in the remains of the ancient caledonian forest of the Scottish highlands. Parrot crossbills feed on seeds of conifer trees, especially Scots pine, and also spruce and larch. Some invertebrates are also eaten when nesting.
THIS INFORMATION IS FROM THE RSPB HANDBOOK OF BRITISH BIRDS BY PETER HOLDEN AND TIM CLEEVES
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