Spawn object on ground

i made a animal spawn script but my animals are spawning at y 500 so that they dont spawn under the map. how could i make it that my animals spawn on the ground and not 500 on the y axis or under tha map. my map has alot of mountains

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class AnimalSpawner : MonoBehaviour
    public Transform animalSpawner;
    public GameObject Animal;
    public int xPos;
    public int zPos;
    public int animalCount = 10;
    private LightningManager lightManager;
    void Start()
        lightManager = GameObject.FindObjectOfType<LightningManager>();

    void Update()
        if (animalCount <= 50){

    void SpawnAnimasl()
        while (animalCount < 10)
            xPos = Random.Range(1, 1600);
            zPos = Random.Range(1, 1600);
            Instantiate(Animal, new Vector3(xPos, 500, zPos), Quaternion.identity);
            animalCount += 1;

Physics.Raycast up from your calculated random xz-position at y = 0 (or wherever your lowest terrain point is) until you hit a ground collider, then instantiate your animal at the hit.point. That should handle both cases of them spawning too far up and below terrain.


if(Physics.Raycast(rndPos, Vector3.up, out RaycastHit hit))
    Instantiate(prefab, hit.point, Quaternion.identity);

Make sure to check if you hit ground! E.g. by comparing tags, or (ideally) using a layermask.

You can use raycast to get distance from animal to ground and then move that animal down by that distance.