I like the diversity, and I don't see any reason to consolidate the animal-people varieties into categories, any more than I think animals themselves should be so consolidated.
Neither do I mind the frequency of animal people and giant animals. It really makes those biomes where they exist eerie to be in. It's great for atmosphere. The fact that normal animals have their own normal regions and fantastically altered, animal-like creatures have their own, more remote, regions gives those different regions a great way of being different from each other, and having distinct personalities.
The only change I might like to see is in the descriptions of animal people. Specifically, I wish they weren't all merely people with animal heads. I wish they could be anthropomorphosed in more creative ways, ways that might differ from species to species and involve more than simple structural permutations or body part mix-and-match.
Some also need better descriptions. I don't know what a Kea is!
I'm with you on that. Had to google that very one.
I thought that was the point of including animals like kea, kakapo, chinchilla, and so on. Their inclusion encourages players to find out about these animals and their status as threatened species, care about them, educate themselves, and hopefully make a difference.