I used models of the skulls and several books nl.
Big cats and their fossil relatives A. Turner en M Anton,
Mammoths, sabertooths and hominids J. Augusti en M.Anton,
Horns, tusks & flippers D.R. Protheros en R.M. Schock,
Vertebrate palaeontology M.J.Benton,
Ice age mammals of N. America I.M. Lange,
Rise of the mammals M.J. Benton,
Prehistoric mammals R.J.G. Savage en M.R. Long,
Chauvet cave J.Clottres,
De grot chauvet J.M. Chauvet, E. Brund Deschamps en C.H. Hillare,
Journey through the ice age P.G. Bahn.
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