The whole book is a poem celebrating that time after the sun sets before dark fully settles in. The illustrations are full of the colors of sunset and twilight. Each two-page spread includes two stanzas describing how different animals behave in the twilight. Repeating lines that come back on each page is one way it ties together in continuity; also the last line of each page gives a foreshadowing of the page to come. Sometimes the illustrations do likewise. An author’s note in the back offers further scientific information about what defines twilight and the animals who are active at that time of day. It really is a beautiful book.