Answer: Birds are attracted to the sound of splashing, bubbling water, which is exactly what your waterfall is providing. I'll bet watching them splash in the water is a delightful experience! Now that you've attracted the birds to your pond, you'll need to provide somewhere for them to roost while waiting for a turn in the water. How about moving the plants aside just a bit and building a waiting area for them? You could use wooden dowels or woody stems (if you want the "natural" look) to fashion several perches. I'm sure they'd rather perch on solid wood than land on your plants.
Hope you enjoy the antics of your feathered friends!
Q&A Library Searching Tips