Citation
Bell, C.P., Baker, S.W., Parkes, N.G., Brooke, M.D. & Chamberlain, D.E. 2010. The role of the Eurasian Sparrowhawk (Accipiter nisus) in the decline of the House Sparrow (Passer domesticus) in Britain. Auk 127: 420. doi:10.1525/auk.2009.09108