Vincent Grafhorst / Quiver Tree (Aloe dichotoma) group on grassland, Keetmanshoop, Namibia

Vincent Grafhorst / Quiver Tree (Aloe dichotoma) group and the Milky Way, Keetmanshoop, Namibia

Theo Allofs / Quiver Tree (Aloe dichotoma) group with rainbow, Namib Desert, Namibia

Piotr Naskrecki / Katydid (Hetrodes pupus) on succulent, Cederberg, Western Cape, South Africa

Michael & Patricia Fogden / Quiver Tree (Aloe dichotoma) at dusk, Kokerboom Reserve, Keetmanshoop, Namibia

Ingo Arndt / Aloe plant flowering {Aloe sp} Namibia

Ingo Arndt / Aloe plant flowering {Aloe sp} Namibia

Yva Momatiuk & John Eastcott / Sociable Weaver (Philetairus socius) nests in Quiver Tree (Aloe dichotoma), Quiver Tree Forest, Namibia

Yva Momatiuk & John Eastcott / Quiver Tree (Aloe dichotoma) group, Quiver Tree Forest, Namibia

Yva Momatiuk & John Eastcott / Rock Hyrax (Procavia capensis) and Quiver Trees (Aloe dichotoma), Quiver Tree Forest, Namibia

Yva Momatiuk & John Eastcott / Quiver Tree (Aloe dichotoma) trunk, Namib Desert, Namibia

Yva Momatiuk & John Eastcott / Quiver Tree (Aloe dichotoma) trunk, Namib Desert, Namibia

Yva Momatiuk & John Eastcott / Quiver Tree (Aloe dichotoma) trunk, Namib Desert, Namibia

Yva Momatiuk & John Eastcott / Quiver Tree (Aloe dichotoma) trio, Namib Desert, Namibia

Yva Momatiuk & John Eastcott / Quiver Tree (Aloe dichotoma) pair in desert, Namib Desert, Namibia

Yva Momatiuk & John Eastcott / Quiver Tree (Aloe dichotoma) trunk, Namib Desert, Namibia

Yva Momatiuk & John Eastcott / Quiver Tree (Aloe dichotoma) in desert, Namib Desert, Namibia

Yva Momatiuk & John Eastcott / Quiver Tree (Aloe dichotoma) pair in desert, Namib Desert, Namibia

Cyril Ruoso / Malagasy spiny bush forest, with Madagascar ocotillo (Alluaudia procera), Aloe tree (Aloe sp) and Berenty Reserve, Madagascar.

Vincent Grafhorst / Quiver Tree (Aloe dichotoma) and star trails, Keetmanshoop, Namibia

Vincent Grafhorst / Quiver Tree (Aloe dichotoma) group, Keetmanshoop, Namibia

Vincent Grafhorst / Quiver Tree (Aloe dichotoma), Keetmanshoop, Namibia

Vincent Grafhorst / Quiver Tree (Aloe dichotoma) group on grassland, Keetmanshoop, Namibia

Vincent Grafhorst / Meerkat (Suricata suricatta) on boulder in Quiver Tree (Aloe dichotoma) grassland, Keetmanshoop, Namibia

Vincent Grafhorst / Meerkat (Suricata suricatta) on boulder in Quiver Tree (Aloe dichotoma) grassland, Keetmanshoop, Namibia

Vincent Grafhorst / Meerkat (Suricata suricatta) on boulder in Quiver Tree (Aloe dichotoma) grassland, Keetmanshoop, Namibia

Vincent Grafhorst / Rock Hyrax (Procavia capensis) juvenile in Quiver Tree (Aloe dichotoma) grassland, Keetmanshoop, Namibia

Vincent Grafhorst / Quiver Tree (Aloe dichotoma) group and star trails, Keetmanshoop, Namibia, stacked image*

Theo Allofs / Quiver Tree (Aloe dichotoma) group stormy sky, Namib Desert, Namibia

Theo Allofs / Quiver Tree (Aloe dichotoma) group and mountains, NamibRand Nature Reserve, Namibia

RHONDA KLEVANSKY / Succulent plants including Quiver trees (Aloe dichotoma) and (Euphorbia sp) in rocky terrain, Richtersveld National Park and World Heritage Site, Northern Cape, South Africa, August 2011.

Piotr Naskrecki / Aloe (Aloe sp) flowers, Gorongosa National Park, Mozambique

Mark Moffett / Aloe (Aloe sp) latex collected in goat skin by Danho village elder, Sad Dahagan, for stomach and skin cures, Drechba Plateau, Socotra, Yemen

Kevin Schafer / Fan Aloe (Aloe plicatilis) in fynbos habitat, Western Cape, South Africa

Cyril Ruoso / Ring-tailed Lemur (Lemur catta) climbing Aloe (Aloe vahombe) to feed on flowers, vulnerable, Berenty Private Reserve, Madagascar

Cyril Ruoso / Ring-tailed Lemur (Lemur catta) peeking out from Aloe (Aloe vahombe) leaves, vulnerable, Berenty Private Reserve, Madagascar

Cyril Ruoso / Ring-tailed Lemur (Lemur catta) pair climbing Aloe (Aloe vahombe) vulnerable, Berenty Private Reserve, Madagascar

Cyril Ruoso / Ring-tailed Lemur (Lemur catta) eating Aloe (Aloe vahombe) vulnerable, Berenty Private Reserve, Madagascar

Konrad Wothe / Madagascar Aloe (Aloe vaombe) flowering, Madagascar

Kerstin Hinze / Mooi River Falls with (Aloe sp) in foreground, Hidden Valley, KwaZulu-Natal, South Africa, October 2006

Kerstin Hinze / Mooi River Falls with (Aloe sp) in foreground, Hidden Valley, KwaZulu-Natal, South Africa, October 2006

Richard Du Toit / Greater Blue-eared Glossy-Starling (Lamprotornis chalybaeus) on aloe, Mpumalanga, South Africa

Piotr Naskrecki / Aloe (Aloe sp) group on rocks, Cederberg Wilderness Area, Western Cape, South Africa

Piotr Naskrecki / Aloe (Aloe sp) group on rocks, Cederberg Wilderness Area, Western Cape, South Africa

Piotr Naskrecki / Quiver Tree (Aloe dichotoma) and other succulent karoo vegetation after rain, Geogap Nature Reserve, South Africa

Piotr Naskrecki / Quiver Tree (Aloe dichotoma) in succulent karoo habitat, South Africa

Piotr Naskrecki / Aloe (Aloe sp), Limpopo, South Africa

Nick Garbutt / Aloe sp. silhouetted at sunset. Anjampolo Forest, southern Madagascar.

Nick Garbutt / Aloe sp. silhouetted at sunset. Anjampolo Forest, southern Madagascar.

Ingo Arndt / Sociable Weaver (Philetairus socius) pair and their nests in Quiver Tree (Aloe dichotoma), Namibia

Ingo Arndt / Quiver Tree (Aloe dichotoma) pair, Namib Desert, Namibia

Ingo Arndt / Quiver Tree (Aloe dichotoma) bark, Namib Desert, Namibia

Stephen Belcher / Quiver Tree (Aloe dichotoma) silhouettes at sunset, Keetmanshoop, Namibia

Stephen Belcher / Quiver Tree (Aloe dichotoma) silhouettes at sunset, Keetmanshoop, Namibia

Sebastian Kennerknecht / Spiral Aloe (Aloe polyphylla), UCSC Arboretum, Santa Cruz, Monterey Bay, California

Piotr Naskrecki / Quiver Tree (Aloe dichotoma) in succulent karoo habitat at night, Goegap Nature Reserve, Northern Cape, South Africa

Piotr Naskrecki / Bastard Quiver Tree (Aloe pillansii) flowering, Richtersveld, South Africa

Piotr Naskrecki / Pearson's Aloe (Aloe pearsonii) in succulent karoo habitat, Richtersveld, Northern Cape, South Africa

Piotr Naskrecki / Quiver Tree (Aloe ramosissima) pair, Richtersveld, Northern Cape, South Africa

Jose B. Ruiz / Aloe flowers {Aloe sp} Spain

Theo Allofs / Quiver Tree (Aloe dichotoma) at dawn, Namib Desert, Namibia

Rob Tilley / Abstract of Tree Aloe {Aloe sp} Naples Botanical Garden, Florida, USA

Ingo Arndt / Quiver Tree (Aloe dichotoma), Kokerboom Forest, Keetmanshoop, Namibia

Winfried Wisniewski / Quiver Tree (Aloe dichotoma) group at sunset, Namibia

Winfried Wisniewski / Quiver Tree (Aloe dichotoma) close up, Namibia

Winfried Wisniewski / Quiver Tree (Aloe dichotoma) in evening

Winfried Wisniewski / Quiver Tree (Aloe dichotoma)

Winfried Wisniewski / Quiver Tree (Aloe dichotoma)

Richard Du Toit / Kokerboom Tree (Quiver tree), Kokerboom Forest, Namibia

Richard Du Toit / Quiver Tree (Aloe dichotoma) bark, Kokerboom Forest, Namibia

Michael & Patricia Fogden / Quiver Tree (Aloe dichotoma), Spitzkop, Damaraland, Namibia

Michael & Patricia Fogden / Quiver Tree (Aloe dichotoma) at dusk, Kokerboom Reserve, Keetmanshoop, Namibia

Michael & Patricia Fogden / Quiver Tree (Aloe dichotoma), Keetmanshoop, Namibia

Gerry Ellis / Quiver Tree (Aloe dichotoma) growing on rocky ledge, Namib-Naukluft National Park, Namibia

Jim Brandenburg / Quiver Tree (Aloe dichotoma) backlit by moon, Namibia

Michael & Patricia Fogden / Quiver Tree (Aloe dichotoma) at dusk, Kokerboom Reserve, Keetmanshoop, Namibia

Tim Fitzharris / Aloe (Aloe sp) spines

Gerry Ellis / Quiver Tree (Aloe dichotoma) at dawn, Namib-Naukluft National Park, Namibia

Michael & Patricia Fogden / Green-crowned Brilliant (Heliodoxa jacula) hummingbird male feeding at Aloe flowers, Monteverde Cloud Forest Reserve, Costa Rica

Sebastian Kennerknecht / Common Fiscal (Lanius collaris) male on Krantz Aloe (Aloe arborescens), Kaapsehoop, South Africa

Richard Du Toit / Aloe (Aloe sp) plants, Garden Route National Park, South Africa

Richard Du Toit / Greater Double-collared Sunbird (Nectarinia afra) male feeding on Aloe (Aloe sp) flower nectar, Garden Route National Park, South Africa

Cyril Ruoso / Quiver Tree (Aloe dichotoma) pair in desert, Namib-Naukluft National Park, Namibia

Cyril Ruoso / Quiver Tree (Aloe dichotoma) trunk, Namib-Naukluft National Park, Namibia

Yva Momatiuk & John Eastcott / Quiver Tree (Aloe dichotoma) in desert, Namib Desert, Namibia

Yva Momatiuk & John Eastcott / Quiver Tree (Aloe dichotoma) trunk, Namib Desert, Namibia

Yva Momatiuk & John Eastcott / Quiver Tree (Aloe dichotoma) trunk, Namib Desert, Namibia

Yva Momatiuk & John Eastcott / Quiver Tree (Aloe dichotoma) in desert, Namib Desert, Namibia

Theo Allofs / Quiver Tree (Aloe dichotoma) and rainbow, Namib Desert, Namibia

Mark Moffett / Aloe (Aloe sp) latex collected in goat skin by Danho village elder, Sad Dahagan, for stomach and skin cures, Drechba Plateau, Socotra, Yemen

Konrad Wothe / Aloe (Aloe macroclada) with dead flowering stalk, Andringitra National Park, Madagascar

Murray Cooper / Cape Aloe (Aloe ferox) flowering, South Africa

Richard Flack / Malachite sunbird (Nectarinia famosa) taking flight from an Aloe (Aloe sp.) flower to catch insect, Balgowan, KwaZulu Natal Province, South Africa, January.

Ann & Steve Toon / Black-headed oriole (Oriolus larvatus) perched on Aloe (Aloe sp.) flowers, Zimanga Game Reserve. KwaZulu-Natal, South Africa.

Ann & Steve Toon / Black-headed oriole (Oriolus larvatus) feeding on Aloe (Aloe sp.) nectar, Zimanga Game Reserve. KwaZulu-Natal, South Africa.

Jeff Foott / Sour pitaya (Stenocereus gummosus) with Aloe (Aloe sp) flower spikes in background. Sonoran Desert, Puerto Balandra, near La Paz, Baja California Sur, Mexico. 2013.