Maybe this question is clear for native speakers, however I cannot find an answer to it.
So only 2 refer to domesticated animals - I'm tempted to think this isn't enough of a requirement.
I'll wait for other views, but I'm tempted to make them synonyms as per Paul's suggestion.
Animals can refer to wild as well as domesticated. Wildlife comprises of a wide variety of topics. Wildlife might refer to animals or birds or reptiles. Clearly, there's a big difference between the two. However, I suggest migrating all the animal tags which relate to wildlife to wildlife tag and renaming animal tag to domesticated-animals tag. That would clear the confusion.