I have an entire shrub border running along the south property line of my house. It completly hides my view of the neighbors drive way. Then I have lots of those lush rose beds. I Know they could hide in there but at the very least I would upon occasion hear them singing. Plus I Have all the flower beds. I spend lots of time in the garden and looking at the plants. Surely I would notice a tree frog or toad sometimes if they were here. But I never do.