Russell grins appreciatively at the thought of this theoretical big danger being turned into a child's pet, content in a comfortably-sized aquarium for the rest of its days. But he has to shrug at the second point.

"It's a bit tricky, isn't it? I think sharks need to swim, even in their sleep."

Not that he knows the type of shark, but he remembers hearing something about some possibly suffocating if they don't keep in motion. Unlike the giant dormouse, which can apparently sleep underground in a cave so long that it's far too large to ever get out again, except by - he assumes - causing more earthquakes and sink holes.