Assuming we use a duck. The duck idle state can transition to swimming state OR walking state OR flying state. How would manage this?

Also I would like to see on the usage of a state transition table to manage these states. Instead of hardcoding on the states to determine which to go next, use a table instead.

The state themselves will execute the actions. Using the old example of duck, when duck is in Flying State/Behavior, it executes flying mode that can bypass any terrain. If its in walking mode, it have to go around obstacles.

This will lead to a better reusable class. We could just plug in any state we want and throw them out if not needed without creating a spaghetti code. All the decision making is in 1 area which is the transition table.