The key feature that separates Faunus from Humans are that they exhibit up to two animal traits such as ears, tails, teeth, claws, eyes, scales, and rarer ones like fish tails, gills, and wings.

In addition, separate from these two traits, Faunus possess excellent hearing and a sense of smell. They might also have superior vision, such as a hawk's keen sight or a nocturnal animal's night vision like a cat or a wolf has. Faunus with lizard or other diurnal animal traits seem to lack this feature.

Heightened hearing, heightened sense of smell, night vision (dependent on species)

Loud noises and high frequencies can be debilitating, as can certain scents (or even perfume) cause migraines.