Most of the book highlights the importance of glutes in the animal kingdom, especially how they incorporate the senses, from the mandrills' red behinds, which help them stick together in the jungle, to the herrings' ultrasonic farts (a sound only they can hear), which help orient them into groups. At the heart of the book, however, is body positivity, emphasized through a range of butt sizes and shapes. - Booklist

Expressive, anthropomorphized butts of different colors serve as guides throughout this big book of butt facts. The breezy, conversational tone complements the text, which begins with a brief evolution of butts, including how the development of mouths and butts led to larger, more intelligent life. - Booklist Back(side)list: Butts Are Where It's At

Cheeky fun, with bits of solid matter. (Informational picture book. 5-7) - Kirkus Reviews.