Bananas and peanuts, after all, are what drives giant pouched rats to excel. Which is why they are often at their worst on Monday morning.
"During the week, they're on a diet; they have to work for their food," Mr. Weetjens said. "But on weekends, they get to eat as much as they want. On Mondays, they just aren't as hungry."
Up to 30 inches long, it thrives in most of sub-Saharan Africa, lives up to eight years in captivity and is "savage" in the wild, Mr. Weetjens says, but so docile when bred that some people keep them as pets.