https://www.bto.org/our-work/science/publications/papers/barn-owl-monitoring-prgramme-establishing-protocol
The Barn Owl Monitoring Prgramme: establishing a protocol to assess temporal and spatial variation in productivity at a national scale
The Barn Owl Monitoring Prgramme: establishing a protocol to assess temporal and spatial variation in productivity at a national scale
Citation
Leech, D.I., Shawyer, C.R., Barimore, C.J. & Crick, H.Q.P. 2009. The Barn Owl Monitoring Prgramme: establishing a protocol to assess temporal and spatial variation in productivity at a national scale. Ardea 47: 428.