One of the most powerful features of Mecanim is retargeting of humanoid animations. This means that with relative ease, you can apply the same set of animations to various character models. Retargeting is only possible for humanoid models, where an Avatar has been configured, because this gives us a correspondence between the models’ bone structure.
Recommended Hierarchy structure
When working with Mecanim animations, you can expect your scene to contain the following elements:-
The Imported character model, which has an Avatar on it.
The Animator Component, referencing an Animator Controller asset.
A set of animation clips, referenced from the Animator Controller.
Scripts for the character.
Character-related components, such as the Character Controller.
Your project should also contain another character model with a valid Avatar.