Andrew Peacock / Acacia (Acacia sp) trees at sunset, northern Kenya

Chien Lee / Sugar Glider (Petaurus breviceps) feeding on Acacia (Acacia sp) tree sap at night, Wasur National Park, Papua, Indonesia

Nick Garbutt / Acacia sp. at night, with a herd of Plains Zebra (Equus quagga) beneath. Near Ndutu, Nogorongoro Conservation Area, Serengeti National Park, Tanzania.

Stephen Belcher / Camelthorn Acacia (Acacia erioloba) dead tree with dunes in background, Namib-Naukluft National Park, Namibia

Gerry Ellis / Whistling Thorn (Acacia drepanolobium) tree over savannah, Masai Mara National Reserve, Kenya

Mitsuaki Iwago / Masai Giraffe (Giraffa tippelskirchi) feeding on Whistling Thorn (Acacia drepanolobium) acacia tree, Serengeti National Park, Tanzania

Mitsuaki Iwago / African Elephant (Loxodonta africana) herd staying cool in the shade of an Acacia tree, Botswana

Gerry Ellis / Whistling Thorn (Acacia drepanolobium) and moon, Amboseli National Park, Kenya

Mitsuaki Iwago / Whistling Thorn (Acacia drepanolobium) tree on savannah at sunset, Serengeti

Gerry Ellis / Umbrella Thorn (Acacia tortilis) trees at sunrise on savannah, Masai Mara, Kenya

Shin Yoshino / Whistling Thorn (Acacia drepanolobium) trees, Masai Mara National Reserve, Kenya

Mark Moffett / Ant (Pseudomyrmex sp) group drink nectar from Whistling Thorn (Acacia drepanolobium) acacia tree and protect the tree from leaf eating enemies ensuring mutual survival, Costa Rica