turtle spawn_rule

{
    "format_version": "1.8.0",
    "minecraft:spawn_rules": {
        "description": {
            "identifier": "minecraft:turtle",
            "population_control": "animal"
        },
        "conditions": [
            {
                "minecraft:spawns_on_surface": {},
                "minecraft:spawns_on_block_filter": "minecraft:sand",
                "minecraft:brightness_filter": {
                    "min": 7,
                    "max": 15,
                    "adjust_for_weather": false
                },
                "minecraft:height_filter": {
                    "min": 60,
                    "max": 67
                },
                "minecraft:weight": {
                    "default": 8
                },
                "minecraft:herd": {
                    "min_size": 2,
                    "max_size": 6
                },
                "minecraft:biome_filter": [
                    {"test": "has_biome_tag", "operator": "==", "value": "beach" },
                    {"test": "has_biome_tag", "operator": "==", "value": "warm"}
                ]
            }
        ]
    }
}