By Peterson, Roger Tory
By Whittley, Sarah, British Trust for Ornithology
By Burton, Robert
By Chapman, Anthony
By Tipling, David
By Marianne Taylor
By Farrand Jr, John
By i-SPY
By Kear, Janet
By Alderton, David
By Elgood, J.H.
By Wansbury, Andrea
By Barnes, Simon, Hoskins, Bob
By Farndon, John
By Burton, John A., Young, Steve
By Greenhalgh, Malcolm
By Simon Barnes
By Verney, Peter
By Rob Hume, Peter Hayman
By Gibbons, Bob, Davis, John
By Moss, Stephen
By Couzens, Dominic, Partington, Peter
By Hammond, Nicholas, Packhan, Chris
By Allan, David
By Jim Flegg, Flegg, Jim
By Aschwanden, Christie, Perris, Andrew
By Tony Soper, Soper, Tony, Busby, John
By Jones, Reginald
By Bailey, Jill
By Pons, Alain, Baillet, Christine