We have a huge problem with feral (mostly cats) and stray animals (both dogs and cats) in Brazil. Their owners usually abandon them in places like parks and zoos, sometimes because the animals are pregnant. I'd like to cite some examples of places that are currently passing thorugh the situation: the Campo de Santana, the Quinta da Boa Vista (where the Rio de Janeiro zoo is located) and the Belo Horizonte zoo. Both the Campo de Santana and the Quinta da Boa Vista are public parks located in Rio de Janeiro. The former has lots of wild and introduced animals, like opossums, agoutis (wild), waterfowl (wild and introduced), marmosets and peafowl (introduced) living along with cats and the latter has smaller problems with those felines but there are still some living there. When I visited the Belo Horizonte zoo, I noticed the presence of some cats, like a group of kittens behind the gorilla exhibit and an adult individual (probably their mother) collecting food from a trash can. Also, what zoo are you talking about?