By Lindsay Galvin
By D.R. Kershaw
By Dr Ross Piper
By Ben Fogle
By John Brackenbury
By Stephen Moss
By Sarah Gibson
By Mike Toms
By Hannah Molloy
By David Taylor
By Duane Quiatt (University of Colorado), Vernon Reynolds (University of Oxford)
By J. Cooter, M. V. L. Barclay
By Archibald Thorburn, Peter Olney
By James Dearsley (Author)
By Stephen Savage
By R. M. Lockley
By Richard Vaughan
By Aidan Cockburn
By Richard Fox, Edward Ruppert, Robert Barnes
By Richard D. Estes, Edward O. Wilson, Daniel Otte
By W.Edward Allen
By Paul Martin, Patrick Bateson (Professor Sir, King's college, Cambridge)
By Curtis C. Travis
By Victoria Stilwell
By Norman K. Wessells
By Andrew F. Fraser, Donald M. Broom, Donald F. Broom
By Dennis King, Valda Fraser
By Aarathi Prasad
By National Research Council, Division on Earth and Life Studies, Board on Agriculture and Natural Resources, Committee on Animal Nutrition, Subcommittee on Dog and Cat Nutrition