1. S. C. Ludwig (https://orcid.org/0000-0003-3209-0568) ✉ (sludwig@gwct.org.uk) and D. Baines (https://orcid.org/0000-0002-3598-8325), Game & Wildlife Conservation Trust, The Coach House, Eggleston Hall, Barnard Castle, DL12 0AG, UK. SCL also at: Langho
2. S. Roos (https://orcid.org/0000-0002-4088-2875), RSPB Centre for Conservation Science, RSPB Scotland, Edinburgh, UK.