Funding for this research was provided by:
BBSRC (BB/L014793/1, BB/J002631/1)
Received: 19 May 2019
Accepted: 26 July 2019
First Online: 14 August 2019
Ethics approval and consent to participate
: The study was approved by the University of Liverpool Animal Welfare Committee. No specific licences were required to carry out the work. Trapping and laboratory faecal collection were in accordance with international best practice guidelines [CitationRef removed]. Neither procedure involved pain, suffering or lasting harm. Traps were checked twice daily by trained personnel, and there was minimal handling of subjects to determine species and sex before subjects were released at their site of capture. Animals housed in the laboratory were provided with cage enrichment and were picked up with a handling tunnel [CitationRef removed].
: EJ is an employee of Waters, the manufacturer of the REIMS system. All other authors declare that they have no competing interests.