Mr. Popper's Penguins

Author: Richard and Florence Atwater
Lexile measure: 910
Language:  No swear words, no potty language.
Violence:  None.
Big Kid Mature Topics:  being responsible for pets, smoking (mentions that Mr. Popper smokes a pipe), poverty.  Some rudimentary geography helpful (North Pole, South Pole, Antarctica).
Illustrations: monocolor drawings every several pages
Plot: moderately complex.

Though some reviewers call this "humor", I would not.  Its not really funny, so much as lighthearted and a little silly.  But in any case, its a fun story (how could any fiction involving penguins be anything but fun?).   Though the Lexile is high, the reader does not have to possess tremendous emotional maturity to understand this book.  This is a terrific one for the  very advanced, but sensitive reader.   DD and I both give it a "thumbs up".