Uses of Interface
org.bukkit.entity.LivingEntity

Packages that use LivingEntity 
Package Description
org.bukkit
More generalized classes in the API.
org.bukkit.entity
Interfaces for non-voxel objects that can exist in a world, including all players, monsters, projectiles, etc.
org.bukkit.event.entity
Events relating to entities, excluding some directly referencing some more specific entity types.
org.bukkit.event.vehicle
org.bukkit.potion
Classes to represent various potion properties and manipulation.
org.bukkit.util
Multi and single purpose classes to facilitate various programmatic concepts.