Denis-Huot / Whistling thorn (Acacia drepanolobium) galls occupied by mutualist ant (Crematogaster sp) Kenya

Denis-Huot / Whistling thorn (Acacia drepanolobium) gall occupied by mutualist ant (Crematogaster sp) Masai Mara, Kenya

Denis-Huot / Whistling thorn (Acacia drepanolobium) gall occupied by mutualist ants (Crematogaster sp) Kenya

Denis-Huot / Whistling thorn (Acacia drepanolobium) gall occupied by mutualist ant (Crematogaster sp) Kenya

Tui De Roy / Rufous-tailed Rock-Thrush (Monticola saxatilis) on Whistling Thorn (Acacia drepanolobium), Laikipia, Kenya

Gerry Ellis / Reticulated Giraffe (Giraffa reticulata) browsing on Acacia (Acacia drepanolobium) trees, Lewa Wildlife Conservancy, Kenya

Mitsuaki Iwago / Giraffe (Giraffa sp) mother and young browsing on Whistling Thorn (Acacia drepanolobium) acacia tree, native to Africa

Shin Yoshino / Leopard (Panthera pardus) resting in Whistling Thorn (Acacia drepanolobium) acacia tree, Masai Mara, Kenya

PREMAPHOTOS / Ants {Crematogaster nigriceps} on swollen thorn of Whistling thorn acacia {Acacia drepanolobium} where they nest, Kenya

Michael & Patricia Fogden / Whistling Thorn (Acacia drepanolobium) and gravel plains at sunrise, Namib-Naukluft National Park, Namib Desert, Namibia

Gerry Ellis / Whistling Thorn (Acacia drepanolobium) in open grasslands, Masai Mara National Reserve, Kenya

Gerry Ellis / Whistling Thorn (Acacia drepanolobium) in open grasslands, Masai Mara National Reserve, Kenya