R. E. Simmons , J. M. Mendelsohn
Ostrich 64 ( 1) 13 -24
R. E. Simmons , R. Altwegg
Journal of Zoology 282 ( 1) 6 -12
R. E. Simmons , M. Griffin , R. E. Griffin , E. Marais
Biodiversity and Conservation 7 ( 4) 513 -530
A. Robertson , A. M. Jarvis , C. J. Brown , R. E. Simmons
Biodiversity and Conservation 7 ( 4) 495 -511
R. E. Simmons
Behavioral Ecology and Sociobiology 23 ( 2) 83 -92
R E Simmons , R J Braby , A Shapira
Marine ornithology 29 81 -84
R E Simmons , W R J Dean , R J Dowsett , Alison Sakko
Bulletin of the British Ornithologists’ Club 122 180 -185
R E Simmons
Raptor research. 18 ( 3) 103 -106
J Braby , L G Underhill , R E Simmons
African Journal of Marine Science 33 ( 2) 247 -254
J Braby , R J Braby , N Braby , R E Simmons
Ostrich 80 ( 2) 71 -75
Dave Simmons , Robert De Villiers
Madoqua 1997 111 -113
Robert E Simmons
Ostrich 81 ( 1) 19 -23
Robert E Simmons
Ostrich 82 ( 1) 75 -76
William Goulding , Richard A Pettifor , Robert E Simmons
Ostrich 83 ( 2) 85 -89
Marie-Sophie Garcia-Heras , François Mougeot , Beatriz Arroyo , Graham Avery
Ostrich 88 ( 1) 1 -8
Morné A du Plessis , Robert E Simmons , Andrew N Radford
Ostrich 78 ( 1) 1 -5
Robert E Simmons , Jessica Kemper
Ostrich 74 ( 3-4) 217 -221
Robert E Simmons , Phoebe Barnard , WRJ Dean , Guy F Midgley
Ostrich 75 ( 4) 295 -308
Robert E Simmons , Colleen L Seymour
Frontiers in Ecology and Evolution 10 943598 -943598
Robert E Simmons , Colleen L Seymour , Sharon T George , Koebraa Peters
Animals 13 ( 6) 1013 -1013