Attributes / relations provided by
♦ 1Wood Janka Hardness Scale/Chart J W Morlan's Unique Wood Gifts
♦ 2del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.).
Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona.
♦ 3Seed dispersal by Ceratogymna hornbills in the Dja Reserve, Cameroon, KENNETH D. WHITNEY, MARK K. FOGIEL, AARON M. LAMPERTI, KIMBERLY M. HOLBROOK, DONALD J. STAUFFER, BRITTA DENISE HARDESTY, V. THOMAS PARKER and THOMAS B. SMITH, Journal of Tropical Ecology (1998) 14:351371
♦ 4Jorrit H. Poelen, James D. Simons and Chris J. Mungall. (2014).
Global Biotic Interactions: An open infrastructure to share and analyze species-interaction datasets. Ecological Informatics.
♦ 5Seasonal Variation in the Feeding Ecology of the Grey-cheeked Mangabey (Lophocebus albigena) in Cameroon, JOHN R. POULSEN, CONNIE J. CLARK, AND THOMAS B. SMITH, American Journal of Primatology 54:91105 (2001)
♦ 6The diet of chimpanzees in the Budongo Forest Reserve, Uganda, NICHOLAS E. NEWTON-FISHER, Afr. J. Ecol. 1999, Volume 37, pages 344354