I initially thought this was a Postman Butterfly, which this zoo does keep, but it looks different from some of the others so I'm not sure if it's a different species? Or just a different colour pattern?
Identify the 39 species of postman butterflies basing just in colour patterns can be tricky, since each species can have tons of different colour morphs and each of these colour morphs is very similar to the same colour morphs of various other species in same genus, an extreme case of Müllerian mimicry often used as the prime example of it in evolutionary biology. See for example:
where C, F, G and H are the same species and K, L, M and P are also a single species.
I think yours is just Heliconius melpomene that tends to be, together with the rather unvariable H. charithonia, the most common species of the genus displayed in butterfly houses.
