Hissing distractions

I live in the woods, in a healthy eco-system that includes snakes. On these colder autumn days, they enjoy sunning themselves on the roof tiles, which must feel heavenly to a cold-blooded creature. Below is a pic I took yesterday of a boomslang (literally, 'tree snake') on our roof. It's probably a female, since she's darker than the lighter, brighter green of the males.

It's quite hard to concentrate on writing with all this wildlife about! But I'm doing my best...