Hawjabran

The Hawjabrans are an alien race in Animorphs.

Physiology
The Hawjabrans have several central nervous nodes located all over their bodies instead of a primary brain, making them useless for the Yeerks to infest.

History
During the early years of the Yeerks' path to dominating the galaxy, the Yeerks once tried to make into Controllers. After attacking a Hawjabran Colony Ship, the Yeerks quickly abandoned the idea upon discovering that Hawjabran's physiology possessed a widespread nervous system.

Culture
They were a space-faring culture and according to Ax their freighters resembled an Enterprise-D from Star Trek: The Next Generation.

Source

 * Animorphs 8: The Alien (1997)
 * The Hork-Bajir Chronicles