Unsigned in the pond above Morelet's crocodiles. Most likely a Mexican/Central American species. Sorry for the green tint, the lighting was unavoidable.
@Kyle's Creatures Their website is several years outdated, so it is not reliable. On their site it still lists that there are great tinamou on exhibit with golden lion tamarin, which has not been the case for a very long time. This turtle was not on exhibit when the site was relevant, and I am very sure this is not a red eared slider. The red eared sliders are also on exhibit in another region of the aquarium.