Reynolds, T.J., Harris, M.P., King, R., Swann, R.L., Jardine, D.C., Frederiksen, M. & Wanless, S. 2011. Among-colony synchrony in the survival of Common Guillemots Uria aalge reflects shared wintering areas. Ibis 153: 831. doi:10.1111/j.1474-919X.2011.01149.x