What is eating my ferns?

Your ferns could be affected by various pests, such as slugs, snails, caterpillars, or aphids, which are known to munch on their leaves. Additionally, environmental factors like drought or disease may also lead to leaf damage that resembles eating. Inspect the ferns closely for any visible signs of pests or damage. If needed, consider using organic pest control methods or improving the growing conditions to protect your plants.