The two Animal college spells [Animal] Control and Repel [Animal] are actually multiple spells each, with a (subtly, I presume) different version for each of several animal categories. I haven't, however, found an actual definition of the categories, and I need to clear a bunch of rats out of a cellar.
These two spells have a base cost equal to the highest IQ score of the category of animals they work on -- so Mammal Control will be either 5 or 6 to cast (depending whether the GM includes great apes at IQ 6 in the category), but Vermin control wouldn't be any higher than 3.
The question is, though, which category includes rats? Biologically, they're rodents, which are mammals, but socialogically and for many other purposes they're often considered vermin. If they're "mammals" for the purposes of these spells, Repel Mammal is impactical (area spell, base cost 6 goes out of range for low-point characters at radius 2), but if they're "vermin" the same character might be able to cast a radius 3 or even 4 Repel.
Is there a rule I've missed, or an official ruling, on whether rats are "mammals" or "vermin"?