Back in 1931, plans were made to move the Barcelona Zoo to the Montjuïc hill area; said project was halted by the Spanish civil war, but what if it didn't have to be that way? Here's a parallel vision of the Barcelona Zoo in a different area (now the Botanical Garden)!
Species list in the comments.
In this alternate continuity, the entire Ciutadella Park is incorporated into the Barcelona Zoo; this proves tricky, as many culturally and politically important sites must remain the same.