"The shot caught the hindquarters of the rhinoceros. For a horrifying moment the front legs kept running. The creature — a girl named Tricia — toppled forward, dug its horn into the dirt, rolled over, and was dead."
"Slowly our team formed a line. Grizzly. Gorilla. Tiger. Andalite. Hawk. Wolf. Then James's team. Lion. Crocodile. Bobcat. Bull. Then Craig's team. And Erica's. Slowly the visser's attention was caught. Maybe I imagined the look of fear that flitted across his enigmatic Andalite face as he surveyed our forces. Maybe not. But for the first time since this war had begun, it looked like a fair fight."
When the Animorphs began looking for new members, Tricia was one of the recruits selected by James. Her disease, condition or reason for being in the children's hospital is unknown, but she was not healed by the morphing process. Tricia chose a rhinoceros her battle morph.
"I felt sick inside. I should do something. I should stop this. That was the auxiliary Animorphs down there on the ground dying. Burning."
Tricia, along with the rest of the Auxiliary Animorphs, were killed in the final battle against the Yeerks' Pool ship. They had sacrificed their lives to assist Sam Doubleday's ground force as the original Animorphs invaded the Pool ship. Jake heard Visser One gleefully order the Pool ship's gunners to kill any animals in the fight below, until the gunners report none are left.