Kim Taylor / Cylindrical leaf beetle (Cryptocephalus hypochaeridis) portrait, Surrey, England

David Fleetham / Trumpetfish (Aulostomus chinensis) and Longjaw squirrelfish (Sargocentron spiniferum) with school of Bigscale soldierfish (Myripristis berndti) behind. Coral reef, Maui, Hawaii.

Dave Watts / Common wombat (Vombatus ursinus) cylindrical droppings / faeces on rock, Tasmania, Australia

Dave Watts / Common wombat (Vombatus ursinus) cylindrical droppings / faeces on rock, Tasmania, Australia

MYN / Gil Wizen / Gunther's cylindrical skink (Chalcides guentheri), Carmel Mountain Range, Israel, March. Vulnerable species. meetyourneighbours.net project

Paul Harcourt Davies / Leaf Beetle (Cryptocephalus hypochaerides) highly metallic beetles on leaves, Garagano, Puglia, Italy, May

Paul Harcourt Davies / Leaf Beetle (Cryptocephalus hypochaerides) highly metallic beetle often on flower heads. Garagano, Puglia, Italy, May

Kim Taylor / Cylindrical leaf beetles (Cryptocephalus hypochaeridis) on hawkweed flower. Surrey, UK, June.

Bryan and Cherry Alexander / Nganasan woman wearing traditional cylindrical Reindeer / Caribou skin boots. Taymyr, Northern Siberia, Russia, 2004.

SINCLAIR STAMMERS / Fossils of Burrowing trilobites (Homalonotus / Trimerus linares) (Salter) from the Middle Devonian period, Patacamaya, Bolivia. The cylindrical body shape plus shovel nose headshield possibly indicate...

Angelo Giampiccolo / A seagull perching on one of the statues that adorns the Ponte Sant' Angelo (Angel's bridge), Rome, Italy. The bridge, also known as Pons Aelius, spans the river Tiber and leads to the Castel Sant'Ang...

Solvin Zankl / Amphipod (Streetsia challengeri) portrait, showing unique eye structure where the left and right eyes have fused into a single cylindrical photoreceptor. This structure, occupying the basal half of a...

Joel Sartore / Photo Ark / Philippine cylindrical snake (Hologerrhum philippinum) portrait, UPLB Museum of Natural History, Los Banos, Philippines. Captive.

Joel Sartore / Photo Ark / Philippine cylindrical snake (Hologerrhum philippinum) portrait, UPLB Museum of Natural History, Los Banos, Philippines. Captive.

Joel Sartore / Photo Ark / Philippine cylindrical snake (Hologerrhum philippinum) head portrait, UPLB Museum of Natural History, Los Banos, Philippines. Captive.

Joel Sartore / Photo Ark / Canary cylindrical skink (Chalcides viridanus) head portrait, Wroclaw Zoo. Captive, occurs in Canary Islands.

Joel Sartore / Photo Ark / Canary cylindrical skink (Chalcides viridanus) portrait, Wroclaw Zoo. Captive, occurs in Canary Islands.

Joel Sartore / Photo Ark / Canary cylindrical skink (Chalcides viridanus) portrait, Wroclaw Zoo. Captive, occurs in Canary Islands.

Joel Sartore / Photo Ark / Canary cylindrical skink (Chalcides viridanus) head portrait, Wroclaw Zoo. Captive, occurs in Canary Islands.

Tony Wu / Male Crowned seahorse (Hippocampus coronatus) nestled amongst Holmes seaweed (Codium cylindrical), carrying a pouch full of developing juveniles that are almost ready to emerge, Japan, Pacific Ocean.

Bruce Thomson / Coastal banksia (Banksia integrifolia) close up of distinctive cylindrical flower, Jervis Bay, New South Wales, Australia.

Bruce Thomson / Lantern banksia (Banksia ericifolia) close up of distinctive cylindrical flowers, Jervis Bay, Australian Capital Territory, Australia.

Bruce Thomson / Coastal banksia (Banksia integrifolia) distinctive cylindrical flower, Jervis Bay, New South Wales, Australia.

Ingo Arndt / Tree Beekeeping of Honey bees (Apis mellifera) - 'queen cage' aged 100 years. Tree hive beekeeping is a traditional practice that goes back 1000 years, Poland.

Fabio Pupin / Three toed skink (Chalcides chalcide) basking near a trail used by bikers, Italy.

Rod Williams / Leaf beetles (Cryptocephalus aureolus) mating pair, Hutchinson's Bank, New Addington, London, England, UK. June.