Batty Penderwick is a character from the children's book series, "The Penderwicks," written by Jeanne Birdsall. She is the youngest of the four Penderwick sisters and is known for her imaginative spirit and love for nature. Batty often wears a pair of butterfly wings, which reflects her whimsical personality. In the series, Batty shares a close bond with her sisters, Rosalind, Skye, and Jane, as they embark on various adventures during their summer vacations. The stories highlight themes of family, friendship, and the joys of childhood, making Batty a beloved character among readers.