Paul Williams / Red leaf monkey (Presbytis rubicunda) mother holding baby, Danum Valley, Sabah, Borneo, Malaysia August.

Michael D. Kern / Maroon eye / Moon frog (Leptopelis uluguruensis) captive, from East Africa

Tim Fitzharris / Quaking Aspen (Populus tremuloides) grove in fall colors, Maroon Bells, Snowmass Wilderness, Colorado

Pete Oxford / Maroon eyed leaf frogs {Agalychnis litodryas} Esmeraldas, Ecuador

Oscar Dewhurst / Long-billed sunbird (Cinnyris lotenius) nectaring on flowers. Goa, India. September.

Sergio Hanquet / Purple sea urchin (Sphaerechinus granularis). Tenerife, Canary Islands.

Nick Garbutt / Orange backed red langur (Presbytis rubicunda chrysea) in rainforest understorey. Danum Valley, Sabah, Borneo, Malaysia.

Heather Angel / Broomrape (Pedicularis longiflora) in wet meadow amongst Horsetail (Equisetum sp). Maroon marks on flowers act as Nectar guides. Road from Barkham to Ruo Er Gai, Sichuan Province, China. July.

Gary Bell/ Oceanwide / Spine-cheek Anemonefish (Premnas biaculeatus) juvenile in sea anemone, Great Barrier Reef, Australia

Chase Dekker / Mountains reflected in lake, Maroon Bells, Aspen, Colorado

Bert Willaert / Spinecheek anemonefish (Premnas biaculeatus) living in a symbiotic relationship with Bubble-tip anemone (Entacmaea quadricolor). Kimbe Bay, West New Britain, Papua New Guinea

Constantinos Petrinos / Juvenile spine-cheek anemonefish (Premnas biaculeatus) in its host Bubble-tip Anemone (Entacmaea quadricolor) Lembeh Strait, North Sulawesi, Indonesia.