What is the difference between functional and behavioural models in sofrware engineering? What are examples of each?

All behavioural models really do is describe the control structure of a system. This can be things like:

Sequence of operations Object states and Object interactions

All functional models really do is describe the computational structure of the system. On the other hand, this system - even though it may have many Use Cases - should only have one functional model, yet this may be composed of many functional diagrams.