Wildlife Spotting

This could be Aristolochia littoralis - they are of interest here in Australia : have a read of this "The plant is native to Brazil, and is an invasive species in Australia and in the southern United States. In Australia the Aristolochia littoralis is fatal to the caterpillars of Ornithoptera euphorion and of the threatened Richmond Birdwing Butterfly and threatens to displace their proper host plant, A. tagala" - Wikipedia http://en.wikipedia.org/wiki/Aristolochia_littoralis I do find these flowers very attractive.

You know they have a false opening in the yellow center to goes to the pipe on the back.

Aristolochia is such an interesting plant.

Not sure of the species, maybe elegans or littoralis.