e621 made a lot of mistakes in categorizing creatures.
In reality, characters categorized as "anthro" should be categorized as "humanoid" (since their main characteristic is a body similar to that of a human).
The exact definition of anthropomorphism: "Anthropomorphism consists of attributing human behavioral or morphological characteristics to other entities such as gods, animals, objects, phenomena, ideas, or even beings from another world, if applicable".
Therefore, an anthropomorphic being is not necessarily humanoid; because human characteristics such as expressions, behavior, and language are sufficient to qualify a creature as anthropomorphic. Therefore, it could be a "Feral" too.
Moreover, even the term "Feral" is poorly chosen. In reality, it should be "Theriomorph."
And yes, I went to look it up.
Moreover, what people generally call "Furry" should be called "Therianthrop", and this should include humanoid beasts as well as theriomorphs, but also creatures like centaurs, mermaids, etc.
Furthermore, the term "furry" simply means "having fur." This remains vague (the term doesn't imply any human characteristics) and poorly classifies creatures, as some of them have neither fur nor hair, like the Scalies.
Therefore, the term Therianthrope is preferable.
Therion = Beast, and Anthro(p) = Human.
"Furry" is a poor term.
As for Theriomorph, it means "having the form of a beast."
While the term "Anthropomorph" implies human characteristics but not necessarily a humanoid form, the term "Theriomorph" is the opposite, as it doesn't necessarily imply the characteristics of a beast. It primarily refers to the "bestial" form of the creature (body, head, legs).
Therefore, "theriomorph" is the appropriate term, unlike "Feral", which (incorrectly) removes any anthropomorphic connotation from the creature.
Furthermore, since theriomorphs (which you mistakenly call "Ferals") are partly anthropomorphic (as they can possess human characteristics), their sexual relations with humans or humanoids should not be categorized "bestiality." Because of their human characteristics, they should be considered equal to humans, despite their bestial form.
Imagine a creature that moves by crawling or walking on all fours, but is capable of speaking and/or thinking like a human. Logically, it should not be considered a beast if it can speak and think like us. Not to mention that theriomorphs sometimes also exhibit behaviors and gestures similar to those of humans.
Finally, those you call "Anthro" should be tagged: Anthro & Humanoid.
And those you call "Feral" should have the tags: Anthro & Theriomorph.
One last detail:
Humans tend to use the term "animal" to refer to other species, yet it is scientifically proven that humans are also animals.
Therefore, the term we should use to differentiate non-human animal species is "beast."
This is why I believe the term "zoo" should mean "animal" (including humans), and the term "therion" should mean "beast." Just to make a distinction.
Updated by Rainbow Dash