Sorry to bump this up, but I noticed something weird.
Cassie takes Ax's temperature and says she can't confirm if Ax has a fever since she doesn't know the normal body temperature of an Andalite; Ax tells her it's 91.3 degrees, as in degrees Celsius.
Biologically speaking, this is an extremely high body temperature. For reference, pure water boils at 100 degrees Celsius. Ax's temperature while in a fever was 95.5 degrees; that's pretty frickin high. Shouldn't the animorphs have been burned the moment they touched him?
Also, that was his temperature after he has 30 seconds of water drinking, which would presumably cool his body down a few degrees or so. Wouldn't the water in Cassie's trough (which Ax was drinking from) have started boiling or turned to steam? It isn't likely that the water was a pure sample, and with the impurities, it could have led to a lower boiling point.
Also, four books earlier, when Ax and the Animorphs were stranded in the North Pole after escaping from the Blade Ship, Cassie asks him how he's holding up.
Cassie: "Ax? How are you holding up?"
Ax: <I am holding nothing up. I am slowly freezing to death. I doubt I can maintain brain function for more than a few minutes.>
This wouldn't have made much sense, since Ax would have been very warm. Yes he would have lost heat, but nowhere near his body shutting down from hypothermia. Furthermore, his core body temp would have been enough to melt the venbar upon touching them. At the very least.
Any chance this is a KASU, or just a handwave as "aliens can have higher temperatures than biologically feasible"?