*Feathers are not only a means of avian  locomotion—they also have many secondary purposes for birds. “Feathers  can warm like a blanket... or cushion like a pillow,” writes Stewart.  “Feathers can shade out sun like an umbrella... or protect skin like  sunscreen.” Making skillful use of trompe l’oiel, Brannen’s delicate,  refined watercolors give the project the feel of a birders’ scrapbook,  as though the feathers, “photographs,” informational notes, and other  ephemera that appear have been taped, stapled, and clipped to the pages  (one note even has a telling coffee cup stain). A focused and thorough  examination that highlights the striking beauty of these often-unnoticed  natural objects.
-Publishers Weekly, *starred review
An album of images and a simple text reveal that birds' feathers are far more versatile than one might expect. Comparing feathers to familiar objects, Stewart reveals that birds  use them in surprising ways. Her two-level text is headlined with a  comparison and includes a short paragraph of explanation. Laid out like a  scrapbook, her words share a page or spread with accurate and appealing  watercolor images of a bird (identified by species and location), the  everyday object in question and the feather. From backyard blue jays and  cardinals to exotic manakins and peacocks, the 16 birds used as  examples come from all over. The rosy-faced lovebird in Namibia carries  nesting material in its tail feathers, like a forklift. For the Alaskan  winter, a willow ptarmigan grows feathers on its feet that serve as  snowshoes. In Mongolia, a Pallas' sandgrouse uses his spongelike belly  feathers to soak up water to bring to his nestlings. On a concluding  spread, text and illustrations together provide an example of one  possible system of feather classification. Sepia-toned endpapers show  some of the feathers described. Other than a note about Birdwatching magazine, the author doesn't indicate her sources, but considerable research by both author and illustrator is evident. 
The combination of thoughtful approach and careful crafting makes this an excellent resource for early nature study. 
-Kirkus Reviews
Compact, consistent entries, most set in  attractively composed double-page spreads, focus on the many ways in  which birds benefit from their feathers. Some uses are not too  surprising, such as the wintry Maine blue jay's feathers that "trap a  layer of warm air next to its skin" or the peacock's glorious feathers  that help him attract a mate. The book, though, also features plenty of  feather utilities that kids (and adults) may not have known or carefully  considered, such as the club-winged manakin's ability to make "squeaky  chirping little trills" with its curved and ridged feathers, or the  spongy feathers of the Pallas' sandgrouse, who uses them to bring water  to his nesting chicks. Each bird gets a lovely portrait set in its  habitat, captioned with its identity and a precise geographic location. A  brief paragraph, just the right length for classroom or storytime  sharing, explains the utility of the bird's plumage, and the entries are  unified by a line of oversized font that runs across the tops of the  spreads and compares feathers to a familiar human device: "Feathers can  dig holes like a backhoe . . . or carry building supplies like a  forklift." Beautiful and concise, this is an excellent resource for  units on animal adaptation, and a treat for the youngest bird lovers. An  author's note on research, and a caution concerning the prohibitions on  gathering wild bird feathers, are appended.
-The Bulletin of the Center for Children's Books
Feathers are deceptively simple marvels of  adaptation, providing not just locomotion for birds, but also  protection, warmth, decoration, and comfort. This book celebrates the  amazing versitility of these easily recognizable objects, which young  readers might find right in their backyards. Vividly rendered watercolor  illustrations of feathers in life-sized scale complement the  straightforward text that describes 16 species of birds and the  unexpected functions of their feathers. Common birds, such as jays,  cardinals, penguins, and swans, share pages with more exotic species,  like the rosy-faced lovebird of Namibia and a type of sandgrouse found  in the Gobi Desert. Stewart describes how chicks suck on the wet  feathers of their parents to quench their thirst and how males of some  species can play a type of high-pitched, squeaky love song by shaking  their wings to attract female mates. Part science journal, part  read-along nonfiction, Feathers succeeds in what such science  books for young readers should strive to do: help young minds spot the  extraordinary in the seemingly mundane.
-Booklist
Birds and the remarkable variety of their  feathers are the focus of this beautifully illustrated volume. In  addition to their use for flight, feathers of all shapes and sizes  provide birds with warmth and cooling, protection from the sun, and the  ability to dig, swim, or glide. On each double-page spread, designed to  evoke a bulletin board, the simple main text (in larger font) points out  the primary functions of the featured feathers, while text boxes  present facts specific to the representative species featured, along  with small images of objects used by humans that are analogous to each  feather's purpose (e.g., sun block, life jacket, umbrella). Brannen's  delicate watercolors include pictures of birds in action using their  feathers for various purposes as well as wonderfully detailed close-ups  of the feathers themselves. Some of the ideas can be conveyed with a  picture of a single feather; others are illustrated by several feathers  from a single bird, as in a striking image of the five different feather  structures found on the familiar blue jay.
-The Horn Book