Sloths, despite their names, are not lazy. Like some of my other favorite critters, their evolutionary commitment to a low-value food source means that they spend a lot of time eating for very little caloric reward (see also koalas and giant pandas). This to say I get the joke of the book, but I'm not in favor of using stereotypes of species to beat kids over the head with a moral lesson, even when the species in question comes out alright at the end. That's lazy storytelling.
I'll stick with A Little Book of Sloth, thanks.
Library copy