“Dwarves are sequential hermaphroditic parthenogens," Ruby said, anticipating his question.

"What?"

"They can change back and forth from male to female and are capable of fertilizing themselves to make more dwarves. They exhibit what we regard as male characteristics, typically, but some favor a more feminine approach."

Durham sat with his mouth hanging open. Ruby poked him in the tongue with her quill feather making him gag and sputter.

"So, Ginny is, what, short for Regina? Virginia?"

"I rather think it's long to 'Gin'," Ruby answered. "She's head of hazard team and Thud's second."

"So, the changing sex thing. How does that work? Does it take a while or is it the sort of thing that might happen in the middle of a conversation?"

"Hard to say," Ruby said. "Does she need to clear her throat or did she just become a male? Is he just pausing for thought or did he just impregnate himself mid-sentence?" She shrugged. "Dwarf physiology isn't really my field."

"Is there an easy way to tell?"

"Which sex a dwarf is at the moment? Not that I'm aware of but I haven't managed to think of a situation where it would matter, either, so I've not dwelt on it much.”