Bernard Castelein / Speckled bush cricket (Leptophyes punctatissima) resting on leaf, Brasschaat, Belgium. August.

Bernard Castelein / Grayling butterfly (Coenonympha pamphilus) resting on St. John's wort (Hypericum perforatum) seedheads, Klein Schietveld, Brasschaat, Belgium. August.

Bernard Castelein / Roe deer (Capreolus capreolus) female, feeding on ferns in woodland, Peerdsbos, Brasschaat, Belgium. July.

Bernard Castelein / Roe deer (Capreolus capreolus) male, standing in woodland, Peerdsbos, Brasschaat, Belgium. July.

Bernard Castelein / Roe deer (Capreolus capreolus) male, feeding on ferns in woodland, Peerdsbos, Brasschaat, Belgium. July.

Bernard Castelein / Roe deer (Capreolus capreolus) male, feeding on leaves in woodland, Peerdsbos, Brasschaat, Belgium. July.

Joel Sartore / Photo Ark / Usambara three-horned chameleon (Trioceros deremensis) looking around, Tiergarten Schonbrunn, Vienna. Captive.

Joel Sartore / Photo Ark / Hoge's side-necked turtle (Ranacephala hogei) looking around. This species is endemic to the eastern Atlantic Forest of Brazil. Turtle Island, Graz, Austria. Critically endangered. Controlled conditio...

Joel Sartore / Photo Ark / East African green mamba (Dendroaspis angusticeps) looking and flicking its tongue, Kentucky Reptile Zoo, Kentucky. Captive.

Joel Sartore / Photo Ark / Eastern diamondback rattlesnake (Crotalus adamanteus) looking and flicking its tongue, Kentucky Reptile Zoo, Kentucky. Captive.

Joel Sartore / Photo Ark / Sumatran slow loris (Nycticebus hilleri) male looking round at the camera, Taman Safari, Jawa Timur. Endangered. Captive.

Joel Sartore / Photo Ark / Sumatran slow loris (Nycticebus hilleri) male looking at the camera, Taman Safari, Jawa Timur. Endangered. Captive.