"I've never worked with rats before, so I don't know how tall the walls need to be." He points to a question mark he wrote where there should be a dimension for the maze wall height.

Ringo, for his part, is sniffing about Bruce's shoulder for further crumbs, and decides that his neck, and then his ear might hold answers. Tiny whiskers and a nose poke into Bruce's ear and he laughs, leaning away from the sensation and into Betty's shoulder.

"Hey! There's nothing yummy about my ear!"