I don’t remember which Animorphs book it is, but at least one of them features a scene with an Andalite (an alien, basically a blue furry centaur with stalk eyes and a tail with a razor sharp scythe) who encounters some humans for the first time in his life, and he is initially terrified and begs the humans to stop when they take off their jackets, as he thinks they are ripping off their own flesh.