A place to sit

I often like to sit in the garden. A cup of coffee, chocolate biscuit, the birdsong, it's all so enjoyable. I choose a comfy place, the swing seat or the picnic table, to watch the others who enjoy the garden too. And passing by are lots of birds, the occasional sparrow hawk and once, a little muntjac deer. But here is someone who didn't choose a comfy seat. Balanced with a wobble now and then, stolen peanut in hand, he perched for several minutes. For all the world as though he was a highly decorative hat for the stone mermaid who sits in the birdbath. Why? Only he  knows!