The Change
Tobias who morphed into a hawk and couldn't return to human form is given the chance to gain back his powers.
Animorphs (Fictitious character), Science fiction, Metamorphosis, Extraterrestrail beings, Juvenile fiction
Katherine Applegate
Katherine Alice Applegate is an American writer, best known as the author of the Animorphs, Remnants, Everworld and other book series. She won the 2013 Newbery Medal for her children's novel The One and Only Ivan. Applegate's most popular books are science fiction, fantasy, and adventure novels. She won the Best New Children's Book Series Award in 1997 in Publishers Weekly. Her book Home of the Brave has won two awards. - [wikipedia](https://en.wikipedia.org/wiki/Katherine_Applegate)