This darkling beetle (?) looked almost black with naked eyes but when diffused with even lighting, it will shows its hidden "oil spill" colors. How beautiful! Taken at night in Singapore.
Quote from en.wikipedia.org/wiki/Darkling…
Darkling beetles are a family, Tenebrionidae, of beetles found worldwide, estimated at more than 20,000 species. Many of the beetles have black elytra, hence their common name. Apart from the 9 subfamilies listed here, the tribe Opatrini of the Tenebrioninae is sometimes considered a distinct family, and/or the Pimeliinae are included in the Tenebrioninae as a tribe Pimeliini.
Darkling beetles eat both fresh and decaying vegetation. Major predators include birds, rodents, sun spiders, and lizards. Some species live in the dry Namib desert and have evolved modifications that help them collect water from the fog that condenses on their elytra.
The larval stages of several species are cultured as feeder insects for captive insectivores.