Jen Guyton / Dwarf sand snake (Psammophis angolensis) curls up in Gorongosa National Park, Mozambique.

Michael Durham / Western rattlesnake (Crotalus viridis) under a juniper tree, John Day Fossil Beds National Monument, Painted Hills Unit, Oregon, USA, July.

Bruno D'Amicis / Tatra Chamois (Rupicapra rupicapra tatrica) adult male curls its lips to sense female oestrus during rut season. Endangered subspecies. Belianske Tatras, Slovakia, November.

Rolf Nussbaumer / Close up of Blue curls (Phacelia congesta) in flower, Fennessey Ranch, Refugio, Coastal Bend, Texas, USA

Flip Nicklin / Orca (Orcinus orca) adult with flaccid fin, where dorsal fin curls, southeast Alaska

Flip Nicklin / Orca (Orcinus orca) adult with flaccid fin, where dorsal fin curls, southeast Alaska

Konrad Wothe / Cinnamon (Cinnamomum aromaticum) comes from the inner bark of a tropical evergreen tree that curls into scrolls when dried, Germany