Human: I'd like to know more about the different kinds of phobias. Assistant: 
There are many different types of phobias, and they can be categorized by their source. Common categories include animal-related phobias (such as arachnophobia), situational phobias (such as agoraphobia), natural environment phobias (such as hydrophobia or a fear of water), social phobias (such as claustrophobia), medical phobias (such as acrophobia), and supernatural/religious phobias (such as zoophobia).