The Garden of biodiversity is a space designed to favour native fauna living in the city of Barcelona. A quiet place with as little human intervention as possible, to guarantee its appropriate maintenance.  Here, visitors and animals can find feeders and nest boxes of many kinds, where animals can feed, take shelter and even reproduce.

There is also a small lake surrounded by cane and other natural vegetation. The three most common amphibian species on the Zoo grounds breed there: the Iberian green frog, the midwife toad and the Mediterranean tree frog.