Animals
From Curious Pastimes Wiki
The Beast Empathy and Beast Command skills are limited to “living creatures with animal intelligence,” but what does that mean, exactly?
The short answer is, if it’s not undead, a demon, a construct or a spirit, it’s living; and if it growls and grunts and doesn’t speak, it has animal intelligence.
If uncertain, note that the Ranger skill includes the ability to identify animals!