@David Matos Mendes ah very nice. That sounds like a great asset to local biodiversity preservation! Does either zoo have signange discussing their native birds or on-grounds habitat preservation (ie that tract of intact Atlantic Forest)?
@UngulateNerd92
São Paulo has many signs talking about the fragment of atlantic forest it is located in, many of them mentioning the species that live there in free range and telling people not to touch or get too close to these species in case they meet any of them. The institution also has arboreal bridges linking the trees of the zoo to the other forest fragments in the other side of the avenue that gives access to the place, so that the risk of wild animals being ran over by cars decreases. They also mention monitoration of this free ranging fauna, and provide veterinary treatment when needed.
Belo Horizonte has signs talking specially about the species of plant that live in the fragment it is located in, although I'm pretty sure veterinary treatment is also provided to free ranging animals when needed.
Brasília, afaik, develops some handling proccesses with capuchin monkeys that live in the zoo's ground, and as the other two, much probably provide veterinary treatment to the free ranging fauna.
From the institutions I visited, these are the ones I'm able to remember knowing things related to this dealing with native fauna. I tend to think Zooparque Itatiba's crew also develops similar programs, as there are even maned wolves living in their grounds.