Ronald Summers, Author at British Ornithologists' Union

Ron (now retired) worked as a research biologist for the RSPB for 32 years, primarily studying birds in pinewoods.

Co-occurence of Common and Parrot Crossbills

By Ronald Summers|2024-06-03T10:37:53+00:003 Jun 2024|movements|

Why irruptions of Common Crossbills and Parrot Crossbills co-occur – the role of key and non-key conifers