Baby Fae body began generating isohaemagglutinins, but a suitable donor could not be found in time. Prior to the procedure, no infant heart transplant—even with human hearts—had been successfully performed due to a lack of infant human hearts. To address this issue, Bailey had become a pioneer in the research of cross-species heart transplants, which had included "more than 150 transplants in sheep, goats, and baboons". Multiple surgeons had previously experimented with baboon heart implants, leading some to speculate even that baboons could be farmed in the future for such purposes. When asked why he had picked a baboon over a primate
The Heart of a Warrior still are ordering Ravenpaw around. Ravenpaw wonders why Barley isn't doing anything about it. Later in the day, Barley gets angry at Hoot and Jumper saying that he doesn't like how they are treating his friend and claims that loyalty is everything, not blood. Ravenpaw sees this but doesn't help Barley, knowing that he can handle it on his own. Hoot and Jumper later leave the barn for good. Ravenpaw and Barley finally have their home, together, and as their own. The Heart of a Warrior The Heart of a Warrior is the third book in the Ravenpaw's Path series