I've been spreading my PZ time about equally between two zoos.
My franchise zoo "Aardvarks AarCool" is focused on the community challenge. I've got 16 aardvark habitats spread across two, rather fancy, limestone exhibit houses. My idea is that once the challenge is over, I'll convert some of those habitats to other small animals, like pangolins and anteaters, since it would be quite unrealistic to have so many aardvarks in one zoo and have such elaborate buildings for them. This zoo also has camels, zebras, buffalo, lions (yellow and albino), aldabera tortoises, African elephants, and a place for Indian elephants (which I'll add as soon as I've built up enough funds to feed them). It might get hyenas too before the week is done. All are animals that I'm trying to breed up better stats for over time to place in other zoos, and should keep me busy this week while the aardvarks go through their life cycles.
I've also been working on a new sandbox zoo, unimaginatively named "MOD-ern Zoo", where I've been playing with the new non-replacement mods. Because I'm new to this, I've been keeping them segregated into one zoo for now, but will likely incorporate them into other sandbox projects as I go. For now, I'm just so grateful to have them. I've turned off nearly all the welfare issues so that i don't break anything, so it's kind of my "relaxation" zoo where I just get to watch the new guys run around!