Sean Crane / Celebes Black Macaque (Macaca nigra) scratching head, Tangkoko Nature Reserve, Sulawesi, Indonesia

Chien Lee / Spectral Tarsier (Tarsius tarsier), Tangkoko Nature Reserve, Sulawesi, Indonesia

Chien Lee / Lilac-cheeked Kingfisher (Cittura cyanotis), Tangkoko Nature Reserve, Sulawesi, Indonesia

Tim Laman / Female Knobbed hornbill (Aceros cassidix) in flight. Tangkoko Batuangus / Dua Saudara Nature Reserve, Sulawesi Island, Indonesia.

Michael & Patricia Fogden / Green-spotted Swallowtail (Graphium tynderaeus) butterfly, Tangkoko Batuangus Reserve, Indonesia

Tui De Roy / Woka Palm (Livingstonia rotundifolia) and buttress in lowland rainforest understory, Tangkoko-Dua Saudara Nature Reserve, Sulawesi, Indonesia

Tui De Roy / Sulawesi Red-knobbed Hornbill (Aceros cassidix) male delivering figs to a female sealed inside hollow nest cavity, Tangkoko Dua Saudara Nature Reserve, Sulawesi, Indonesia

Tui De Roy / Sulawesi Red-knobbed Hornbill (Aceros cassidix) male delivering figs to female sealed inside hollow tree, Tangkoko-Dua Saudara Reserve, Indonesia

Mark Jones / Sulawesi Red-knobbed Hornbill (Aceros cassidix) breeding male in a fruiting Fig tree (Ficus forsteni) 32 meters above the ground in rainforest canopy, Tangkoko-Dua Saudara Nature Reserve, Sulawesi, In...

Mark Jones / Sulawesi Red-knobbed Hornbill (Aceros cassidix) breeding male in fruiting Fig (Ficus forsteni), Tangkoko-Dua Saudara Nature Reserve, Sulawesi, Indonesia

Chien Lee / Lilac-cheeked Kingfisher (Cittura cyanotis), Tangkoko Nature Reserve, Sulawesi, Indonesia

Chien Lee / Great Eared-Nightjar (Eurostopodus macrotis), Tangkoko Nature Reserve, Sulawesi, Indonesia