Well, that depends which Moshling Zoo you mean. The Nintendo DS game "Moshling Zoo" recently came out but if you mean online, then, the Moshling Zoo has always been there for paid members!
suey is not avalible yet in any moshling zoo
shambles is a currently known moshling in the moshling zoo but is not out yet
He's not in the zoo yet so you might not know if he's a moshling
Wallop is a real moshling but it has not been released yet. I am a member and have seen his name in the moshling zoo. It is part of the Tunies set.
Furnando has not yet been released as a moshling, so it is not known how to get Furnando. Furnando appears in the Luckies Set in the Moshling Zoo,
You can not change the background in the Moshling Zoo on Moshi Monsters.
You have to be a paid Moshi Member to have access to the Moshling Zoo through the Moshling Zoo Door on Moshi Monsters.
All the moshlings are on the cover of the Moshi Monsters Moshling Zoo game. The moshling in the circle that says "Exclusive In Game Moshling" is Nipper the Titchy TrundleBot which is the moshling you get with the code that comes with the Moshling Zoo Game.
You can not get Nipper the moshling unless you buy the Moshi Monsters: Moshling Zoo game for Nintendo DS and get the code.
You can not have a Moshling Zoo unless you have a paid Moshi Membership.
Once you complete one moshling set, that part of the zoo will be more colorful than the rest of the Moshling Zoo. To keep making your zoo more colorful, you have to keep completing moshling sets.
The Moshling Zoo is the place where your moshlings go when they are not in your house. You can go to the Moshling Zoo to read about the moshlings, see which moshlings you have and which ones you still need to collect, and to put different moshlings into your house. The Moshling Zoo is only available to paid Moshi Members.