She chews on her pencil, considering the problem. "It should probably be higher than they can stand..." She'll have to measure each of the rats and get an average.

Betty looks over to see Ringo inspecting Bruce's ear for food and giggles despite herself, reaching around to try and save him from being sniffed to death. Picking up Ringo carefully off his shoulder and not realizing how close she was now. "Easy, he's company. Be nice."