[cypher]

I don't think there is a comprehensive thread here either but there are a few key things to be aware of.
Ears held up generally alert & happy, ears down, nervous or unwell.
Excessive face washing, often seen during the early stages of taming/bonding, nervous.
Sudden emptying of pouches also a sign of fear or nervousness.
Hunched body usually indicates ill health.
Other than that I find body language is usually fairly easy to interpret.