How does the author use foreshadowing in The Evolution of Calpurnia Tate?

Callie and Grandfather's first outing together is marked by the discovery of a rare hummingbird's nest, symbolizing the unique and special relationship on which they are embarking. Although her grandfather has an extensive collection of specimens, he gives the nest to Callie to begin her own collection. He also begins to mentor her by teaching her the proper way to observe and experiment with nature and the importance of recording her observations, foreshadowing an important occurrence later in the novel.