you can find, animal herds, crocodiles, and things that no longer exist, are found in the Martin Johnson Documentaries. Worth every penny. If you dig adventure, Africa, Sociology, or even Aviation you have got to check them out. Circa 1920's and 30's, they were basically the first to film these things. Look past the campy dialogue and all those animals! Selby was just a babe back then.
http://www.safarimuseum.com/research/archives-and-library/movies/