Graffen's Children

Graffen's Children were a primitive, peaceful alien race that were wiped out by the Howlers.

Physiology
Graffen's Children were a tall tree-like speices, looking similar to the cartoon character, Gumby, except they had rough, dark-blue skin.

History
They once lived on the Graffen's Children's Homeworld, which is a vast rainforest planet until the Howlers wiped their entire species to extinction.

Culture
They were a non-technological species wandering the jungles of their world. Evene when encountering a new strange creature they were filled with child-like innocence and sought only to pet it rather than run away.

Source

 * Animorphs: The Attack