AN OIL BEETLE

I think it's obvious were the name comes from.

Another of todays posts here.....

https://365project.org/markp/365/13-10-2019

[Joanne Diochon]

The colours reflecting off his back certainly do look like the colours you find on the top of a spilled oil slick.

[Junko Y]

I've never seen anything like this but it's beautiful -- did that beetle leave those purple marks on the leaf?