Wakayama Castle Park Zoo
This zoo has been popular among the locals in Wakayama for more than 100 years since the Taisho era. As the name indicates, it is located on the ground of Wakayama Castle and is home to 79 mammals of 21 species, 83 birds of 26 species, and 5 reptiles of 2 species (as of March 2021).
It's a free zoo. The place isn't very big—just a small zoo—but the staff really put effort into introducing the animals. The surroundings are also really nice.