By Reader's Digest
By Paul Sterry
By David Attenborough
By Clive Newsome
By Ricklefs, Robert E., Miller, Gary L.
By Sutton, George P.
By Potton, Craig, Craig Potton
By Pat Morris, Amy-Jane Beer
By John Arlott
By Schaller, George B., George B. Schaller
By Fitter, R. S. R.
By Muus, Bent J.
By Boyd, Alastair
By Jongh, Brian De
By Pizzy, G., Doyle, Roy
By Newby, Eric
By Burton, Anthony
By Bedford, Bruce L.
By Goddard, John
By John Reader, Harvey Croze
By Roth, Gunter D.
By Fitter, R. S. R., Fitter, Alastair H.
By Fitter. Richard and Fitter. Alastair.
By Attenborough, Sir David
By Harris, Keith, Buczacki, Stefan T.
By William Searle, Gerard J. Morel, Wolfgang Hartwig
By King, Ben F., Dickinson, Edward C., Woodcock, Martin W.