Age: Kindergarten-2nd grade
Familiar Experience: Blowing chunks, barfing, feeding your young, retching, and (my favorite) thunder-chunder rainbow parfait

Anyways, this is a lovely bibliotherapeutic look at barfing in public. Carlson also shows the potential embarrassment of going back and how no one will be mad at you for barfing.
Nonfiction or fiction? Well, there is an "interesting made-up fact" about lizards and Carlson depicts all animals turning green before they barf and we all know how incorrect that presentation is.