How can you keep algae from growing in a birdbath and fountain but not harm animals?

To prevent algae growth in a birdbath or fountain without harming animals, regularly change the water every few days to keep it fresh and inhibit algae development. Adding a small fountain or water circulation can also help maintain oxygen levels and discourage algae. Additionally, consider using natural solutions like adding a few drops of vinegar or a small amount of non-toxic, animal-safe algaecide. Lastly, placing the birdbath or fountain in a shaded area can reduce sunlight exposure, which promotes algae growth.