By Mark Carwardine, Erich Hoyt, R. Ewan Fordyce, Peter Gill, Mark Carwardine, Erich Hoyt
By david williams, Steve Benbow, Peter Gill
By A. K. Legg, Peter Gill
By Geoffrey Ponton, Peter Gill
By Peter Gill
By Erich Hoyt (Whale and Dolphin Conservation Society, UK and International), Ewan Fordyce, Peter Gill, Mark Carwardine
By Peter Gill, Simon Armitage