It's kind of counterintuitive to say that Ferals belong to the same cathegory as anthros. The reason the class "anthros" exist in the first place is to distinguish them from the ferals.

"anthro" comes from the word "antrhopomorphic"
Anthropo: 

• Anthropo- (from Greek Άνθρωπος, "human"), a prefix meaning human, humanoid, or humanlike, especially with regards to sentience

Morphos: a combining form meaning “form, structure,” used in the formation of compound words: morphology. Also, esp. before a vowel,morph-.Cf. -morph, -morphic, -morphism, -morphous

Read more: morpho-: meaning and definitions | Infoplease.com dictionary.infoplease.com/morp…

In summary Anthropomorphic means something like: Of human form, something that posseses human characteristics and/or shape.
In other words, if something is Feral is because is not Anthropomorfic, at the same time something Antrhopomorfic can't be feral.