The woodland landscape in Britain has changed enormously over the last century, most notably through the planting of large areas of North American conifers (Sitka spruce and lodgepole pine) and larches from Europe and Japan. Prior to these plantations, the native Scots pine was the only conifer available to common crossbills when irrupting crossbills arrived from the European continent.
Click here to read the rest of the article.: Which non-native conifer is most profitable for common crossbills to feed on in Britain? – Saving Species – Our work – The RSPB Community