The wings of the Ulysses Butterfly (10-13 cm wingspan) have metallic blue upper surfaces, with black borders. 
Underneath they have a cryptic brown pattern.
Like most Swallowtails, the hindwings each have a tail.
The males are especially attracted to blue objects. 
Collectors often exploit this by using a piece of blue paper or cloth to attract the butterflies.
They are considered to be one of the most elusive butterflies and can be very hard to take photographs of.
The Ulysses Butterfly is found in the tropical rainforests of Northern Queensland, Northern islands of Australia and Papua New Guinea.

Daintree Rainforest, Queensland, Australia, 27 October 2022