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

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

Thomas Marent / Umbrella Thorn (Acacia tortilis) trees at sunset, Serengeti National Park, Tanzania

Thomas Marent / Umbrella Thorn (Acacia tortilis) trees at twilight, Serengeti National Park, Tanzania

Konrad Wothe / Grey-headed Social-Weaver (Pseudonigrita arnaudi) nests in Acacia (Acacia sp) tree, Ruaha National Park, Tanzania

Konrad Wothe / Acacia (Acacia sp) trees and hot air balloon, Serengeti, Tanzania

Konrad Wothe / Star trails, Serengeti National Park, Tanzania, east Africa

Gerry Ellis / Long-crested Eagle (Lophaetus occipitalis) perching in Whistling Thorn (Acacia drepanolobium) acacia tree Serengeti National Park, Tanzania

Konrad Wothe / Masai Giraffe (Giraffa tippelskirchi) browsing on Acacia (Acacia sp), Arusha National Park, Tanzania