My frog is completely ignoring the flies.

    private GameObject flyPrefab;

    [SerializeField]
    private int totalFlyMinimum = 12;

    private float spawnArea = 25f;

    public static int totalFlies;

    // Use this for initialization
    void Start()
    {
        totalFlies = 0;

    }

    // Update is called once per frame
    void Update()
    {

        // while the total number of flies is less than the minimum...
        while (totalFlies < totalFlyMinimum) {

            //... then increment the total number of flies...
            totalFlies++;

            //... Create a random position for a fly
            float positionX = Random.Range(-spawnArea, spawnArea);
            float positionZ = Random.Range(-spawnArea, spawnArea);

            Vector3 flyPosition = new Vector3(positionX, 2f, positionZ);

            //... and create a new fly.
            Instantiate(flyPrefab, flyPosition, Quaternion.identity);
        } ```