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.

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

Steven David Miller / Olive-backed Sunbird (Nectarinia jugularis) male on a Hibiscus flower to feed, Rollingstone Beach, North Queensland, Australia. September.

Steven David Miller / Olive-backed Sunbird (Nectarinia jugularis) male taking turns with his mate to bring nesting material to their nest, Cape Hillsborough National Park, Queensland, Australia

Steven David Miller / Olive-backed Sunbird (Nectarinia jugularis) A female olive-backed sunbird returns to her nest, Queensland's Cape Hillsborough National Park Australia

Juergen Freund / Olive-backed sunbird (Cinnyris jugularis) female tending chicks in her nest. Daintree , Queensland, Australia

Juergen Freund / Olive-backed sunbird (Cinnyris jugularis) building nest, Daintree , Queensland, Australia

Dong Lei / Green-tailed sunbird (Aethopyga nipalensis) perched, Mount Qomolangma National Park, Tibet, August.

Juergen Freund / Olive-backed sunbird (Cinnyris jugularis) nesting. Queensland, Australia.

Juergen Freund / Olive-backed sunbird (Cinnyris jugularis) female perched on an automobile side mirror, Queensland, Australia.

Juergen Freund / Female Olive-backed / Yellow-bellied Sunbird in her nest (Cinnyris jugularis) Australia.