Are there blue butterflies? I looked it up.

Wikipedia - Papilio ulysses, the Ulysses butterfly (also commonly known as the Blue emperor), is a large swallowtail butterfly of Australia, Indonesia, Papua New Guinea and the Solomon Islands. Its size varies depending on subspecies, but the wingspan is about 10.5 cm (4.1 in) in Queensland.

This butterfly is used as an emblem for tourism in Queensland, Australia.