There are the info-boards:
Births:
Arrivals:
Rarities of the zoo? The terrarium of the zoo is one of my favorite parts. There are a lot of reptiles (some of them critically endangered) and there are always a lot of births (there's a nursery where you can see the newborns... I think I uploaded some pics). But the best of the terrarium is its crocodilian collection. In the last 10 years I have counted that they had a total of 14 crocodilian species, but currently there are "only" 11.
Another rare species that you can see at the zoo are: golden headed quetzal, Long-wattled umbrellabird, black-faced impala, ... (I don't remember any more

)
But the list of the species (and breeding/conservation programs) will be very different in some years because the remodelation of the zoo. We don't know the animals that will remain or the new species that could arrive... we only know that there will be animals from the asian steppe, african savannah (mainly the Sahel region), rainforest and endemic animals (but these don't appear in the map that was presented). In fact, the only confirmed animal is the Komodo dragon (the construction of its new exhibit should start to be build the first semester of the current year)
The zoo released a new webpage with information of the project of new zoo (Marine and Ciutadella zoo):
Zoo de Barcelona: Un Zoo que val per Dos (web only available in Catalan, but you can try to translate it with the Google translator or ask to me what you want to know).
Inside this webpage you can find this PDF with the biomes represented in both zoos and at the page 4 you can see some silhouettes of animals, but we don't know if these animals will be at the new zoo, but there's very possible:
http://www.zoobarcelona.com/ZOO_Barcelona/zoodos/im/mapes/biomes.pdf
We don't know so much about the new zoo.... only the information that appears in the web I posted before and all is very schematic. I hope that in the next months the Zoo tell to us more info about the project (maybe some plans of the new exhibits or the animal list).
If you plan to visit the zoo and you need info ask it to me

For now I can only say that don't try to go on weekend because there are a lot of families there (seems that a half of Barcelona is inside the zoo

) and it's impossibly to walk inside the terrarium after 11:00.