When the limit is maxed out (Yes, I know not what others expect here .. that one ultimate Mega builds large zoo, where the guest as at Disneyland takes over a week to be able to explore all that?) Then you can make some animals free and add new species. There are also interesting achievements that can be made with each species or to take pictures of animals. The are also successes. Or you can simply make a new Zoo on to other successes contrary to work :)
So far I have a lot of fun with it and play regularly. Hope, however, that with several animal species are soon an extension (also for Xbox 360). Unfortunately, I somehow missing the wolves, dingoes, leopards etc. :) I do not like in the Xbox One is. But I strongly tend already so, me to buy the game for the Xbox One again later.
So far I am very excited!