"So," says a voice of rattling leaves and creaking branches. "At last you return."

But what do you recommend to an adult who doesn't read much speculative fiction, to get them hooked?

It's not likely to happen, / but should it, it would strike / without warning.

Our keepers, the scientists, had used complicated words like metamorphosis and hormones and camouflage to explain us. We could turn invisible, they'd said. We could change from male to female and back. Survival adaptations, they'd called it. I wondered if what Yenny did was for our survival.