Species list Butterfly valley:
Red-collared widowbird
Star finch
Green iguana
Long-tailed finch
Gouldian finch
Island canary (Domesticated form)
African silverbill
Asian blue quail
Crested wood partridge
Cumberland slider
Red-eared slider
Indeed the hanging gardens are beautiful! As is the rest of the Orchideeënhoeve. It's the largest "butterfly garden" of the Netherlands, although its really surpassed that status by now. You can visit it in about an hour in theory, but I spent all day here for the photo report (and because its gorgeous).
It's located Central/North in the Netherlands, and I do recommend a visit. Especially in October, when the rare Widowbird is in breeding plumage!