Depends.
In general its okay, good second use of the rigg, they do look quite different, the realism builders are happy and maybe just like with the second gibbon they are gonna expand on the customisation a bit, like for example choosing between multiple different climbing frames, which would be great.
However this mostly depends on the pack if they are great.
Lets all be honest to ourself, every pack that could have a small bird we should have ond atleast in our hearts.
The bat, butterflies and sloth are all nice but if we get only birds for the exhibit slot noone will be sad.
However, while the WE as it currently is works great for small birds in big flocks (humming birds, small parrots, song birds), it would be rather suboptimal for water birds (yes a scarlet ibis can fly, but they could literally be implemented as a tiny flamingo and nothing would be lost) and birds of prey, as they often spend most of their time on the ground anyways and only fly to get from a to b, aka how the crane, peafowl and flamingo are allready handled in game, so animals like eagles, vultures and owls for all means really could and imo should be habitat animals.
With an owl hopefully introduced as an habitat animal, the exhibit slot for a potential nocturnal pack frees up, where the two toed sloth would be quite welcome.
Im quite sure a scenery pack consisting of the snowy owl, a random felid but lets say ocelot for continent diversity, lori, a nocturnal marsupial and the sloth would sell like crazy just by the prestige of the owl alone, so a good clone for the exhibit sounds both like a realistic and appreciated call to me.
I actually do like birds and would gladly welcome them (one habitat or in the case of walkthrough exhibits 5) in each DLC! Man, one of my favorite Wetlands DLC animals was the crane if I remember right.