Behavioral Indicators

I would like to invite any one and everyone to add their own experience here, I would like to create a reference of behavioral indicators that predict a future behavior.
For example.
An alpaca or llama that switches his weight to the opposite leg is probably preparing to pick up the other foot
When an alpaca is going to cush he will drop the head and bend on front leg.
You can use this thread to either ask questions about the meaning of a particular behavior or you can offer your own experience about the meaning of a behavior.