This morning I took this photo of a Heliconius erato petiverana feeding on hotlips in the morning sun, near the insectaries in Gamboa. The colours really shine very bright in the morning light.
Morning sun
Home of the passion vine butterflies
Sorry, but I should call this Heliconius erato demophoon, although even that name may now be invalid – see the recent paper by Hill et al (doi:10.1111/mec.12290)