According to the latest issue of Cinefex magazine, the Kong special effects technicians do not appear to have used any scientific consultants for most of the animals. They did conduct some research on gorillas to try to make Kong appear reasonably accurate.
Andy Serkis, who "modeled" for Kong, studied gorillas both at the zoo and in Rwanda.
See http://www.theonering.net/scrapbook/view/14583
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