Originally they were categorized as "endangered species," but have since been listed as "precious and rare species." Permission must be received from the relevant units of the United Nations in order to use them.
原先它們大部份被列為瀕臨絕種的野生動物，後來改為珍貴稀有類，如要使用，必須經過聯合國相關單位的認可。