So in the meantime of muscle tutorials, I'm also working a few collaboration projects. One being a mtion capture feature short with humans versus an alien race. One of the aliens is structured a bit like a gorilla so I'm researching some anatomatical information regarding them.
Found a really interesting pdf file regarding a gorilla's facial muscle and layout. Should come in handy when facial rigging.
Primates Volume 14, Number 1 - Understanding Gorilla Facial Muscles
Only a little bit to read, but still pretty useful.
Another useful link is the following:
Information About Gorillas
Basically the ins and outs of a gorilla. Quite interesting regarding the feet - opposable big toe looks frigging cool! Another brilliant resource.