Mark Moffett / Galapagos Giant Tortoise (Chelonoidis nigra) in Alcedo Volcano, Isabella Island, Galapagos Islands, Ecuador

Pete Oxford / Galapagos Sulphur Butterfly (Phoebis sennae marcellina) feeding on cactus flower, Alcedo Volcano, Isabella Island, Galapagos Islands, Ecuador

Pete Oxford / Volcan Alcedo Giant Tortoise (Chelonoidis nigra vandenburghi), Alcedo Volcano crater floor, Isabella Island, Galapagos Islands, Ecuador

Tui De Roy / Volcan Alcedo Giant Tortoise (Chelonoidis nigra vandenburghi) wallowing in temporary rainy season pool, Alcedo Volcano, Isabella Island, Galapagos Islands, Ecuador

Tui De Roy / Blue-footed Booby (Sula nebouxii) feeding frenzy following herring school in shallows, Elizabeth Bay, Isabella Island, Galapagos Islands, Ecuador

Tui De Roy / Galapagos Giant Tortoise (Chelonoidis nigra) large male on caldera rim, Alcedo Volcano, Isabella Island, Galapagos Islands, Ecuador

Tui De Roy / Galapagos Giant Tortoise (Chelonoidis nigra) on caldera rim, Alcedo Volcano, Isabella Island, Galapagos Islands, Ecuador

Tui De Roy / Galapagos Giant Tortoise (Chelonoidis nigra) juvenile with flowers, Alcedo Volcano, Isabella Island, Galapagos Islands, Ecuador

Tui De Roy / Volcan Alcedo Giant Tortoise (Chelonoidis nigra vandenburghi) Galapagos Hawk (Buteo galapagoensis) riding on back, Alcedo Volcano, Isabella Island, Galapagos Islands, Ecuador

Tui De Roy / Galapagos Giant Tortoise (Chelonoidis nigra) on caldera rim, Alcedo Volcano, Isabella Island, Galapagos Islands, Ecuador

Tui De Roy / Galapagos Giant Tortoise (Chelonoidis nigra) yawning, Alcedo Volcano, Isabella Island, Galapagos Islands, Ecuador

Tui De Roy / Feral Goat (Capra hircus) herd, new invasion causing rapid desertification of last Giant Galapagos Tortoise stronghold, Alcedo Volcano, Isabella Island, Galapagos Islands, Ecuador

Tui De Roy / Galapagos Giant Tortoise (Chelonoidis nigra) group wallowing in seasonal pond on caldera rim, Alcedo Volcano, Isabella Island, Galapagos Islands, Ecuador

Tui De Roy / Galapagos Giant Tortoise (Chelonoidis nigra) old male in dry season on caldera rim, Alcedo Volcano, Isabella Island, Galapagos Islands, Ecuador

Tui De Roy / Blue-footed Booby (Sula nebouxii) pair overlooking nesting colony, Punta Vicente, Isabella Island, Galapagos Islands, Ecuador

Tui De Roy / Golden Cownose Ray (Rhinoptera steindachneri) schooling in Mangrove (Avicennia sp) lagoon, Punta Moreno, Isabella Island, Galapagos Islands, Ecuador

Tui De Roy / Blue-footed Booby (Sula nebouxii) courtship landing salute at nest site, Punta Vicente Roca, Isabella Island, Galapagos Islands, Ecuador

Tui De Roy / Volcanic eruption, spatter cone formation and lava fountain from radial fissure, February 1979, Cerro Azul east flank, Isabella Island, Galapagos Islands, Ecuador

Tui De Roy / Volcanic eruption, spatter cone formation and lava fountain from radial fissure, February 1979, Cerro Azul east flank, Isabella Island, Galapagos Islands, Ecuador

Tui De Roy / Volcanic eruption, spatter cone formation and lava fountain from radial fissure, February 1979, Cerro Azul east flank, Isabella Island, Galapagos Islands, Ecuador

Tui De Roy / Galapagos Giant Tortoise (Chelonoidis nigra) group wallowing in seasonal pool on caldera rim, Alcedo Volcano, Isabella Island, Galapagos Islands, Ecuador

Tui De Roy / Volcan Alcedo Giant Tortoise (Chelonoidis nigra vandenburghi) with Galapagos Hawk (Buteo galapagoensis) perched on back, Alcedo Volcano, Isabella Island, Galapagos Islands, Ecuador

Tui De Roy / Cerro Azul caldera with lake and tufa cone at 5,900 feet, Cerro Azul Volcano, Isabella Island, Galapagos Islands, Ecuador

Tui De Roy / Volcanic eruption, radial flank fissure, February 1979, lava fountaining from splatter cone at dusk, Cerro Azul, Isabella Island, Galapagos Islands, Ecuador

Ashley Cooper / Empty hydro canal during severe drought. This canal usually takes water to a hydro plant as part of the Tule River hydro system, California, USA, October 2014.

Ashley Cooper / Lake Isabella near Bakersfield, at less than 13% capacity during the 2012-2017 California drought. California, USA, September 2014.

Ashley Cooper / Lake Isabella near Bakersfield, at less than 13% capacity during the 2012-2017 California drought. California, USA, September 2014.

Ashley Cooper / Lake Isabella near Bakersfield, at less than 13% capacity during the 2012-2017 California drought. California, USA, September 2014.

Nick Hawkins / Isabella tiger moth (Pyrrharctia isabella) photographed on white. New Brunswick, Canada, July.

John Abbott / Harlequin Bug (Murgantia histrionica) Lake Isabella, California, June.

John Abbott / Threadwaisted Wasp (Ammophila sp.) Stine Cove, Lake Isabella, near Porterville, Kern County, California, USA, June.

John Abbott / Harlequin Bugs (Murgantia histrionica) mating, on white background, Stine Cove on Lake Isabella, near Porterville, Kern County, California, USA, June.

MYN / Les Meade / Banded Woolly Bear caterpillar (Pyrrharctia isabella) Washington, USA, September.

Visuals Unlimited / Galapagos Hawk (Buteo galapagoensis) in flight, Urbina, Isabella, Galapagos.

Jouan Rius / Landscape of Lake Isabella reservoir, Kern County, California, USA, November 2012

MYN / Clay Bolt / Woolly bear caterpillar larva of Isabella tiger moth (Pyrrharctia isabella) curled up, Dacusville, Pickens County, South Carolina, USA, June. meetyourneighbours.net project

Stephen Dalton / Heliconian butterfly (Eueides aliphera) multiflash sequence of three images in flight, from Venezuela, controlled conditions

Ingo Arndt / Excrement of Spanish moon moth (Graellsia Isabella) Switzerland

Ingo Arndt / Excrement of Spanish moon moth (Graellsia Isabella) Switzerland

Jouan & Rius / Isabella's Heliconian butterfly (Eueides isabella), pair mating, Costa Rica

Jouan & Rius / Isabella's Heliconian butterfly (Eueides isabella), Costa Rica

Nick Garbutt / Galapagos Land Iguana (Conolophus subcristatus). Urvina Bay, Isla Isabella, Galapagos Islands.

Philippe Clement / Isabella's Heliconian butterfly {Eueides isabella} Costa Rica.

Pete Oxford / Crater wall of active Chico volcano, Isabella Is, Galapagos

Pete Oxford / Sulphur fumeroles inside crater of Sierra Negra volcano Isabela Is, Galapagos

Ingo Arndt / Lava cactus {Brachycereus nesioticus} growing on volcanic lava field, Isabella Is, Galapagos

Martha Holmes / Mangrove shoots growing in larva field {R. mangle} Isabella, Galapagos

Luciano Candisani / Tube-dwelling Anemone (Cerianthus sp) with feeding tentacles extracted, Isabella Island, Galapagos Islands, Ecuador