Gabriel Rojo / Marsh deer (Blastocerus dichotomus) male with growing antlers in velvet, Ibera Marshes, Corrientes Province, Argentina

Heather Angel / Great eggfly (Hypolimnas bolina) butterfly male nectaring on Rough-leaved hydrangea (Hydrangea aspera). Male is highly territorial chasing other insects away. Shunan Zhuhai National Park, Sichuan Prov...

Steven David Miller / A Common eggfly butterfly (Hypolimnas bolina) at rest, Cairns Botanical Gardens, Queensland, Australia. Captive.

Russell Laman / Reef manta (Mobula alfredi) getting cleaned of parasites, dead skin, bacteria, and mucus by Blacklip butterflyfish (Chaetodon kleinii) and Moon wrasse (Thalassoma lunare) at a cleaning station in Raja...

Doug Perrine / Raccoon butterflyfish (Chaetodon lunula) portrait, North Kona, Hawaii, Pacific Ocean.

Bruce Thomson / Male Varied eggfly butterfly (Hypolimnas bolina) feeding on Ivory curl (Buckinghamia celsissima) tree blossom, Toowoomba, Queensland, Australia.

Bruce Thomson / Male Varied eggfly butterfly (Hypolimnas bolina) feeding on Ivory curl (Buckinghamia celsissima) tree blossom, Toowoomba, Queensland, Australia.

Bruce Thomson / Female Varied eggfly butterfly (Hypolimnas bolina) feeding on Ivory curl (Buckinghamia celsissima) tree blossom, Toowoomba, Queensland, Australia.