Spawning animals at a random postion on platforms.

^ the kind of level these animals are gonna spawn on.

You can make empty game objects located at where you want your animals to spawn with the tag SpawnPoint and make the animals instantiate at a random spawn point. (untested code)

public GameObject animal; // animal you want spawned

// Start is called before the first frame update
     void Start()
         // an array of spawn points
         GameObject[] spawnPoints = GameObject.FindGameObjectsWithTag("SpawnPoints");
         // does this code 3 to 5 times (you can replace the value with whatever you want)
         for (int i = 0; i < Random.Range(3, 5); i++)
             int spawnPointindex = Random.Range(0, spawnPoints.Length); // random number between 0 and the number of spawn points
             // pick a random spawn point from the array and get the position of it
             Vector3 randomPos = spawnPoints[spawnPointindex].GetComponent<Transform>().position;
             // instantiate animal at random position
             Instantiate(animal, randomPos, Quaternion.identity); // instantiate the animal at the random position

If you want random animals, you can turn the variable animal into an array and get a random index of the array and spawn that animal.

        public GameObject[] animals; // array of animals

getting a random animal from the array: (put this code inside the for loop and replace animal with randomAnimal)

        int animalIndex = Random.Range(0, animals.Length);
        GameObject randomAnimal = animals[animalIndex];

@Rapizer thanks for the answer, but It is not truly random. Since its preset spawn points.I would rather not spam spawn points all over the place. I can, but that might be to many game objects.