Is iceberg lettuce good for zebra finches?

Iceberg lettuce is not the best option for zebra finches, as it has low nutritional value compared to other leafy greens. While it can be offered occasionally as a treat, it should not make up a significant part of their diet. Instead, provide a variety of dark, leafy greens like kale or spinach, which are more beneficial for their health. Always ensure fresh water is available for hydration.