Juergen Freund / Long-spine Porcupinefish (Diodon holocanthus) in its discarded aluminum can home, North Sulawesi, Indonesia. November.

Juergen Freund / Long-spine Porcupinefish (Diodon holocanthus) in its discarded aluminum can home, North Sulawesi, Indonesia. November.

Gary Bell/ Oceanwide / Porcupinefish (Diodon nicthemerus) in defensive posture, Port Phillip Bay, Mornington Peninsula, Victoria, Australia

David Fleetham / Giant porcupinefish (Diodon hystrix) at night. Kauai, Hawaii.

David Fleetham / Longspined / Freckled porcupinefish (Diodon holocanthus), two. Philippines.

Espen Bergersen / Common guillemot (Uria aalge) flock, circling outside the breeding colony at Hornoya birdcliff, Finnmark, Norway.

Michel Roggo / Banded cichlid (Heros severus) in flooded forest. Rio Tabajos, Amazon, Brazil.

Nick Hawkins / Northern moon snails (Euspira heros) move over a sandy bottom off Nova Scotia, Canada. August

Nick Hawkins / Northern moon snails (Euspira heros) move over a sandy bottom off Nova Scotia, Canada. August

Jiri Lochman / Jewel beetle (Temognatha heros) feeding on Eucalyptus flowers, Lake Cronin Nature Reserve, Western Australia, February.

Jiri Lochman / Jewel beetle (Temognatha heros) feeding on Eucalyptus flowers, Lake Cronin Nature Reserve, Western Australia, February.

Jiri Lochman / Jewel beetle (Temognatha heros) feeding on Eucalyptus flowers, Lake Cronin Nature Reserve, Western Australia, February.

Jiri Lochman / Jewel Beetle (Temognatha heros) feeding on Eucalyptus, Dragon Rocks Nature Reserve, Western Australia - February.

John Abbott / Swamp Darner (Epiaeschna heros) female, Pitcher Plant Bog, Big Thicket National Preserve, near Warren, Tyler County, Texas, USA.

MYN / Martin Taylor / Banded cichlid (Heros severus) close to Manacapuru, Brazil. Meetyourneighbours.net project

Michael Pitts / Deacon fish (Heros severus) Amazon, Brazil

ZSSD / Giant Desert Centipede (Scolopendra heros), native to North America