duck

public class droidScript : MonoBehaviour {

    public Collider[] movementZones;
    public moveSpeed = 2;
    private zoneNum = 0;
    private Vector3 target;
    private zoneTime = 0;
    private Vector3 lastPosition;

    void Start() {
        PickTarget()
    }

    void PickTarget() {
        lastPosition = transform.position;
        Bounds zone = movementZones[zoneNum].bounds;
        float targetX = zone.min.x + zone.size.x * Random.value;
        float targetY = zone.min.y + zone.size.y * Random.value;
        float targetZ = zone.min.z + zone.size.z * Random.value;
        target = new Vector3( targetX, targetY, targetZ );
        zoneTime = 0;
    }

    void Update() {
        zoneTime += Time.time * moveSpeed;
        transform.position = Vector3.Lerp(lastPosition, target, zoneTime);
        if (zoneTime >= 1)
        {
            zoneNum++;
            if (zoneNum < movementZones.Length)
            {
                PickTarget();
            } else {
                // Destroy!!!
            }
        }
    }
}