This is one of the first-ever photos of the Bornean rainbow toad, which hasn't been seen since 1924.
The toad is listed as Endangered by the International Union for the Conservation of Nature, because of its small habitat, which is being destroyed by logging. Das is not disclosing the precise location of the toads, to prevent them being captured for the pet trade.
Top image: Indraneil Das. This post originally appeared on New Scientist.