Richard Du Toit / Greater Double-collared Sunbird (Nectarinia afra) male on Pincushion (Leucospermum sp) flower, Western Cape, South Africa

Steven David Miller / Olive-backed sunbird (Nectarinia jugularis) female returning to her nest with nesting material, Cape Hillsborough National Park, Queensland, Australia, September.

Steven David Miller / Olive-backed Sunbird (Nectarinia jugularis) female in her nest, Cape Hillsborough National Park, Queensland, Australia, September.

Jed Weingarten / Wild Wonders of China / Mrs Gould's sunbird (Aethopyga gouldiae) perched on branch, Tangjiahe Nature Reserve, Sichuan Province, China.

Ann & Steve Toon / Malachite sunbird (Nectarinia famosa) feding at flower, Kirstenbosch National Botanical Garden, Cape Town, South Africa, September

Ann & Steve Toon / Orange-breasted sunbird (Anthobaphes violacea), Kirstenbosch National Botanical Garden, Cape Town, South Africa, September

Biraj Sarkar/ BIA / Fire-tailed Sunbird (Aethopyga ignicauda) male feeding on flower nectar, Darjeeling, India

Melvin Grey / Variable sunbird (Nectarinia venusta) adult male on Hibiscus flower, Nairobi, Kenya

Ole Jorgen Liodden / Red-chested Sunbird (Cinnyris erythrocercus) backlit on flower, Rwanda.

Dong Lei / Mrs Gould's sunbird (Aethopyga gouldiae dabryii) male feeding from Chinese wild peach flowers (Prunus davidiana) Kawakarpo Mountain, Meri Snow Mountain National Park, Yunnan Province, China. May.

Dong Lei / Mrs Gould's sunbird (Aethopyga gouldiae dabryii) male hanging upside down and feeding from Chinese wild peach (Prunus davidiana) male blossom, Kawakarpo Mountain, Meri Snow Mountain National Park, Yun...

Kevin Schafer / Southern Double-collared Sunbird (Cinnyris chalybeus) male on Pincushion (Leucospermum sp) protea flower, Kirstenbosch Garden, Cape Town, South Africa