Dryad

A dryad is a tree nymph or tree spirit in Greek mythology. Drys signifies "oak" in Greek, and dryads are specifically the nymphs of oak trees, but the term has come to be used for all tree nymphs in general. They were normally considered to be very shy creatures except around the goddess Artemis, who was known to be a friend to most nymphs.

Dryad in The House of Daniel
With the increase in logging throughout the 20th century, dryad populations in the United States had their habitats wiped out. While the House of Daniel were on their way to Bellingham, Washington, Jack Spivey realized he didn't want to think about how many dryads were forced to abandon their firs to the lumber industry and make homes in shrubs and bushes.