Terry Whittaker / 2020VISION / Flock of Avocet (Recurvirostra avosetta) in flight with Coryton Oil refinery in background, Site of new DP World London Gateway container port, River Thames, Essex, UK, March 2011

Claudio Contreras / Boojum tree (Fouquieria columnaris) at night with the Orion Constellation, Sonoran Desert, Valle de los Cirios Biosphere Reserve, Baja California Peninsula, Mexico, March

Daniel Heuclin / Ocotillo (Fouquieria splendens) in flower, Chihuahuan Desert, Arizona, USA. May.

Daniel Heuclin / Ocotillo (Fouquieria splendens) in flower, Chihuahuan Desert, Arizona, USA. May.

Daniel Heuclin / Ocotillo (Fouquieria splendens) in flower, Chihuahuan Desert, Arizona, USA. May.

Jack Dykinga / Ocotillos (Fouquieria splendens) in flower, Eagletail Mountain Wilderness, Arizona, USA. March.

Jack Dykinga / Ocotillos (Fouquieria splendens) in flower, Eagletail Mountain Wilderness, Arizona, USA. March.

Edwin Giesbers / Succulent (Aeonium pseudourbicum) endemic to Tenerife, Canary Islands

Chris Mattison / Cobweb houseleek (Sempervivum arachnoideum) growing on rocks, Valgrisenche, Italian Alps, Italy.

Pete Oxford / Man and Octopus tree (Didierea trollii) , South Madagascar. November 2018.