Funding for this research was provided by:
Natural Environment Research Council (NE/L003082/1, 1498919, NE/R016429/1)
Received: 27 August 2019
Accepted: 20 September 2019
First Online: 1 November 2019
Ethics approval and consent to participate
: All animal work was conducted according to relevant national and international guidelines. Feather sampling, geolocation deployment/retrieval and mark/recapture studies to obtain survival rates were undertaken under licence from the UK Home Office, the British Trust for Ornithology and Scottish Natural Heritage.
: Not applicable.
: The authors declare that they have no competing interests.