2015

Grobbelaar, A., van As, L. L., van As J.G. & Butler, H.J.B. 2015.  Pathology of eye and brain of fish infected with diplostomids, Southern Africa African Zoology 2015: 1-6. 

2014

Wiid, R. E. & Butler, H.J.B. 2014. Population management of rock hyraxes (Procavia capensis) in residential areas. Pest. Manag. Sci.. doi: 10.1002/ps.3840

Grobbelaar, A., van As, L.L, Butler, H.J.B & van As, J.G. 2014. Ecology of diplostomid (Trematoda: Digenea) infection in freshwater fish in southern Africa. African Zoology. In Press.

 2013

Le Roux, P.D.S., Kok, O.B. & Butler, H.J.B. 2013.  Breeding behaviour and breeding success of feral pigeons in the Bloemfontein urban area. Suid-Afrikaanse Tydskrif vir Natuurwetenskap en Tegnologie. 32 (1) 5 pages. doi: 10.4102/satnt.v

CONTRIBUTING AUTHOR IN

van As, J.G., Du Preez, J., Brown, L. & Smit, N. 2012. The story of life and the environment: an African perspective. Struik Nature. Cape Town.

CONFERENCE CONTRIBUTIONS

Butler, H.J.B. & Kok, O.B. 1995. Deforestation effect of territorial black wildebeests. The South African Academy: Annual congress of the South African Academy of Biological Sciences. Stellenbosch.

Butler, H.J.B. & Kok, O.B. 2006. Relationship between feeding success and group size of cattle egrets (Bubulcus ibis) in the central Free State. Annual congress of the South African Academy of Biological Sciences. Bloemfontein.

Groenewald, H., Butler, H.J.B. & Scoltz, N. 2006. Anura as biological indicators at unrehabilitated uranium mines. Annual congress of the South African Academy of Biological Sciences. Bloemfontein.

Grunewald, H., Butler, H.J.B. & Scoltz, N. 2006. The effect of uranium mines on small mammal populations. Annual congress of the South African Academy of Biological Sciences. Bloemfontein.

Erasmus, A. & Butler, H.J.B. 2009. Behavioural aspects of Bontebok (Damaliscus pygargus pygargus) and Tsessebe (D. Lunatus lunatus) in the central Free State. Southern African Wildlife Management Association Symposium. 13-16 September 2009. Thba’Nchu.

 
Heyns, L., Kok, O.B., Ehlers, K. & Butler, H.J.B. 2009. Using activity patterns and STR markers to distinguish between blesbok (Damaliscus pygargus phillipsi) and bontebok (D. p. pygargus) in the Free State, South Africa. Southern African Wildlife Management Association Symposium. 13-16 September 2009. Thba’Nchu.

Jacobs, N., Butler, H.J.B. & Heyns, L. 2009. Behavioural aspects of sable antelope (Hippotragus niger) in semi-arid regions of South Africa. Southern African Wildlife Management Association Symposium. 13-16 September 2009. Thba’Nchu.

Jooste, E. & Butler, H.J.B. 2009. Geophagy and mineral preference by gemsbok (Oryx gazella) in the southern Kalahari. Southern African Wildlife Management Association Symposium. 13-16 September 2009. Thba’Nchu.

Butler, H.J.B, Kok, O.B. & Van der Westhuizen, W.A. Enzootic Geophagia as a function of zoopharmacognosy. Advancing Rangeland Ecology and Pasture Management in Africa. GRASSLAND SOCIETY OF SOUTHERN AFRICA. 49TH ANNUAL CONGRESS (20-25 JULY 2014). Phillip Sanders, Bloemfontein, Free State

Jacobs, N., Butler H.J.B. Intensive management of sable antelope: The effect of supplementary feeding on aggression. Advancing Rangeland Ecology and Pasture Management in Africa. GRASSLAND SOCIETY OF SOUTHERN AFRICA. 49TH ANNUAL CONGRESS (20-25 JULY 2014). Phillip Sanders, Bloemfontein, Free State

International

Du Plessis, D., Botha-Brink, J., Butler, H.J.B. & De Beer, F.C. 2010. Computerized tomographic examination of non-mammalian cynodont cranial endocasts. 9^th World Conference on Neutron Radiography. Kwa Maritane, Pilanesberg National Park. South Africa. 3-8 October 2010.

Butler, H.J.B., Kok, O.B., Van Der Westhuizen, W.A. 2011. Geophagy Among Antelopes: Behavioural Aspects at Pans in the Kalahari. 1st International Conference on Clays and Clay Minerals in Africa, and 2nd International Conference on Geophagia in Southern Africa, Bloemfontein, South Africa. 19 – 21 October 2011.

Jooste, E., Butler, H.J.B. 2011. Geophagy and mineral preference by Gemsbok (Oyx gazella) in the Southern Kalahari. 1st International Conference on Clays and Clay Minerals in Africa, and 2nd International Conference on Geophagia in Southern Africa, Bloemfontein, South Africa. 19 – 21 October 2011.

Nolte, Z., Butler, H.J.B. 2011. Geophagy among Bovidae in the Southern Free State: Potential Risk of Sand Impaction. 1st International Conference on Clays and Clay Minerals in Africa, and 2nd International Conference on Geophagia in Southern Africa, Bloemfontein, South Africa. 19 – 21 October 2011.

Jacobs, N., Butler, H.J.B. 2011. Behavioural differences between geographical races of the southern sable antelope (Hippotragus niger niger): an explanation of the function and evolution of conspicuous intra-specific morphological differences. 7th International Wildlife Ranching Symposium, Kimberley, South Africa.10 to 14 October 2011.

Wiid, R. & Butler, H.J.B. 2013. Population management of overpopulated rock hyraxes (Procavia capensis) in residential areas.   9^TH European Vertebrate Pest Management Conference (EVPMC9) Turku, Finland. 22 – 27 September 2013 

Olivier P.A, Butler H.J.B. Colour variation of African Bovidae: Opinions of stakeholders in the game ranching and conservation industry. Advancing Rangeland Ecology and Pasture Management in Africa. GRASSLAND SOCIETY OF SOUTHERN AFRICA. 49TH ANNUAL CONGRESS (20-25 JULY 2014). Phillip Sanders, Bloemfontein, Free State.

Etho-ecology. Diverse aspects of behaviour and ecology of birds and mammals are studied under natural conditions in semi-arid regions of southern Africa. Projects which include research on the feeding behaviour of cattle egrets in the Free State, ecology of the brown bear of the Himalayas, aviation control on inland airports, territorial behaviour of black wildebeest, the ecology of feral pigeons in Bloemfontein, comparative behaviour and ecology of the red hartebeest and black wildebeest in the Free State, aspects of the etho-ecology of the bles- and bontebok in the Free State, Anura as biological indicators of unrehabilitated mines in South Africa, the influence of used uranium mines on animal communities and the relation between eye structure and morning song of birds in the Free State have been undertaken.