The popular cartoon that describes life on earth as observed by aliens translates well into picture-book form with a particular focus on cats. Two purple aliens (a child and an adult) follow a household cat around, making notes on everything it does. “The creature walks across a table and shoves a hydration cylinder off! … The creature then begins to self-cleanse with its flavor muscle.” Mundane cat behavior is hilariously reported with pseudo-scientific vocabulary as the two aliens attempt to make sense of the sneaking, hiding, vibrating creature. The back endpapers include a visual glossary of key terms (rest slab = bed, group soft seat = couch, criss-cross floppers = waffles). Children who savor the linguistic humor may enjoy coming up with their own invented terms to describe everyday objects and activities. (Ages 5-9)