David Tipling / Huli Wigmen from the Tari Valley in Southern Highlands of Papua New Guinea, wearing a bill from Blyth's Hornbill as decoration, August 2011

Juan Carlos Munoz / Coloured powder at Pashupatinath Temple, Bagmati River, Kathmandu Valley, Nepal. March 2018.

David Shale / Deep sea amphipod (Cystisoma) swimming, a deep sea species from the Mesopelagic zone. Mid-Atlantic Ridge. Body is totally transparent and the redness in the eye is the visual pigment in the retina.

David Shale / Deep sea amphipod (Cystisoma) swimming, a deep sea species from the Mesopelagic zone. Mid-Atlantic Ridge. Body is totally transparent and the redness in the eye is the visual pigment in the retina.

David Shale / Deep sea amphipod (Cystisoma) swimming, a deep sea species from the Mesopelagic zone. Mid-Atlantic Ridge. Body is totally transparent and the redness in the eye is the visual pigment in the retina.

David Shale / Deep sea amphipod (Cystisoma) swimming, a deep sea species from the Mesopelagic zone. Mid-Atlantic Ridge. Body is totally transparent and the redness in the eye is the visual pigment in the retina.

David Shale / Deep sea amphipod (Cystisoma) swimming, a deep sea species from the Mesopelagic zone. Mid-Atlantic Ridge. Body is totally transparent and the redness in the eye is the visual pigment in the retina.

Kim Taylor / Violet turaco (Musophaga violacea) showing red flight feathers due to turacin, a pigment unique to turacos. Gambia, West Africa

Solvin Zankl / Big fin squid (Magnapinna atlantica) species only known from two specimens collected in the northern Atlantic Ocean. First described in 2006. It is characterised by several unique morphological featu...

Solvin Zankl / Big fin squid (Magnapinna atlantica) species known only from two specimens collected in the northern Atlantic Ocean. First described in 2006. It is characterised by several unique morphological featu...

Doug Perrine / Juvenile Arrow Squid (probably Loligo plei), showing chromatophores (colored pigment sacs) at night. Lighthouse Reef Atoll, Belize, Central America.

Solvin Zankl / Mating behaviour in Common fruit flies (Drosophila melanogaster) studied in laboratory for gene research, a Curly (wings turn up) and Orange (less red pigment in the eyes) mutant female rejects the ma...