Is it safe for cockatiels to eat leaves?

In general, it is not recommended to feed cockatiels leaves as they may not be safe for consumption. While some specific leafy greens, such as spinach and kale, can be offered in moderation as occasional treats, many other leaves may be toxic to cockatiels. It's always best to consult with an avian veterinarian or refer to reliable sources about specific types of leaves before introducing them to your cockatiel's diet.