Nick Garbutt / Masai Giraffes (Giraffa camelopardalis) on open plains browsing Whistling Thorn Acacia (Acacia drepanolobium). Slopes of the Ngorongoro Highlands with the Serengeti Plains beyond, Tanzania. (Digitally...
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Gerry Ellis / Whistling Thorn (Acacia drepanolobium) tree over savannah, Masai Mara National Reserve, Kenya
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Mitsuaki Iwago / Masai Giraffe (Giraffa tippelskirchi) feeding on Whistling Thorn (Acacia drepanolobium) acacia tree, Serengeti National Park, Tanzania
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Gerry Ellis / Whistling Thorn (Acacia drepanolobium) and moon, Amboseli National Park, Kenya
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Mitsuaki Iwago / Whistling Thorn (Acacia drepanolobium) tree on savannah at sunset, Serengeti
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Shin Yoshino / Whistling Thorn (Acacia drepanolobium) trees, Masai Mara National Reserve, Kenya
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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
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Mark Moffett / Ant (Pseudomyrmex sp) gathers carrot-like growths from Whistling Thorn (Acacia drepanolobium) acacia tree for delivery to larva in nest, in return for baby food, ant protects Acacia, Costa Rica
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Mark Moffett / Ant (Pseudomyrmex sp) gathers carrot-like growths from Whistling Thorn (Acacia drepanolobium) acacia for delivery to larva in nest, in return for baby food Ant protects Acacia, Costa Rica
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Tui De Roy / Rufous-tailed Rock-Thrush (Monticola saxatilis) on Whistling Thorn (Acacia drepanolobium), Laikipia, Kenya
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Mitsuaki Iwago / Giraffe (Giraffa sp) mother and young browsing on Whistling Thorn (Acacia drepanolobium) acacia tree, native to Africa
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Shin Yoshino / Leopard (Panthera pardus) resting in Whistling Thorn (Acacia drepanolobium) acacia tree, Masai Mara, Kenya
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Anup Shah / Patas monkey feeds on galls of Whistling acacia tree, Kenya 2002 {Erythrocebus patas}
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Anup Shah / Patas monkey with young in Acacia tree {Erythrocebus patas} Kenya 2002
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Anup Shah / Patas monkey feeds on seeds of Whistling acacia tree, Kenya 2002 {Erythrocebus patas}
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Anup Shah / Young Patas monkey feeds on galls of Whistling acacia tree, Kenya 2002 {Erythrocebus patas}
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PREMAPHOTOS / Ants {Crematogaster nigriceps} on swollen thorn of Whistling thorn acacia {Acacia drepanolobium} where they nest, Kenya
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Anup Shah / Patas monkey {Erythrocebus patas} reaching up to feed on ant galls on Whistling thorn acacia tree, Kenya
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Michael & Patricia Fogden / Whistling Thorn (Acacia drepanolobium) and gravel plains at sunrise, Namib-Naukluft National Park, Namib Desert, Namibia
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Gerry Ellis / Whistling Thorn (Acacia drepanolobium) in open grasslands, Masai Mara National Reserve, Kenya
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Gerry Ellis / Whistling Thorn (Acacia drepanolobium) in open grasslands, Masai Mara National Reserve, Kenya
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Gerry Ellis / Whistling Thorn (Acacia drepanolobium) on savannah, Masai Mara Game Reserve, Kenya
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Gerry Ellis / Whistling Thorn (Acacia drepanolobium) trees in open grasslands, Masai Mara National Reserve, Kenya
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Gerry Ellis / Whistling Thorn (Acacia drepanolobium) trees in open grasslands, Masai Mara National Reserve, Kenya
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Gerry Ellis / Whistling Thorn (Acacia drepanolobium) trees in open grasslands, Masai Mara National Reserve, Kenya
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Mark Moffett / Whistling Thorn (Acacia drepanolobium) thorns are hollow and are occupied by ants, Kenya
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Mark Moffett / Whistling Thorn (Acacia drepanolobium) with Patas Monkeys (Erythrocebus patas) feeding on ants in background, Kenya
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Gerry Ellis / Long-crested Eagle (Lophaetus occipitalis) perching in Whistling Thorn (Acacia drepanolobium) acacia tree Serengeti National Park, Tanzania
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Anup Shah / Young Patas monkey {Erythrocebus patas} feeding on Whistling thorn acacia tree, Kenya
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Anup Shah / Patas monkey and young feeding on Whistling thorn acacia {Erythrocebus patas} Kenya
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Anup Shah / Patas monkey feeding on Whistling thorn acacia tree {Erythrocebus patas} Kenya
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Mark Moffett / Ant (Pseudomyrmex sp) rips apart a vine that grips leaves of its host Whistling Thorn (Acacia drepanolobium) acacia tree left alone, vine could shade and possibly kill the Acacia
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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
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Mark Moffett / Patas Monkey (Erythrocebus patas) feeding off Whistling Thorn (Acacia drepanolobium) acacia tree thorn occupied by Parasitic Ant (Tetraponera sp), Africa
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Mark Moffett / Patas Monkey (Erythrocebus patas) feeding off Whistling Thorn (Acacia drepanolobium) acacia tree thorn occupied by Parasitic Ant (Tetraponera sp), Africa
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Mark Moffett / Patas Monkey (Erythrocebus patas) climbing Whistling Thorn (Acacia drepanolobium) acacia tree in search of thorns occupied by Parasitic Ant (Tetraponera sp), Africa
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Mark Moffett / Patas Monkey (Erythrocebus patas) eating swollen base of Whistling Thorn (Acacia drepanolobium) acacia tree thorn occupied by Parasitic Ant (Tetraponera sp) parasite causes tree to look bare and sickl...
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Mark Moffett / Patas Monkey (Erythrocebus patas) eating piece of Whistling Thorn (Acacia drepanolobium) acacia thorn occupied by Parasitic Ant (Tetraponera sp), Africa
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Mark Moffett / Whistling Thorn (Acacia drepanolobium) thorn occupied by Ant (Tetraponera penzigi) parasite causes tree to look bare and sickly, Africa
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Mark Moffett / Whistling Thorn (Acacia drepanolobium) tree occupied by mutualist Ant (Crematogaster mimosae) the Ants attack anything eating their tree-protecting the tree's leaves, Africa
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Mark Moffett / Ant (Pseudomyrmex sp) chops apart vine touching its Whistling Thorn (Acacia drepanolobium) acacia tree, Costa Rica
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Mark Moffett / Ant (Pseudomyrmex sp) chops apart vine touching its Whistling Thorn (Acacia drepanolobium) acacia tree, Costa Rica
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Mark Moffett / Ant (Pseudomyrmex sp) ripping up vine that disturbs its host Whistling Thorn (Acacia drepanolobium) acacia tree, Costa Rica
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Mark Moffett / Ant (Pseudomyrmex sp) ripping up vine that disturbs its host Whistling Thorn (Acacia drepanolobium) acacia tree, Costa Rica
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Mark Moffett / Ant (Pseudomyrmex sp) ripping up vine that disturbs its host Whistling Thorn (Acacia drepanolobium) acacia tree, Costa Rica
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Mark Moffett / Ant (Pseudomyrmex sp) ripping up vine that disturbs its host Whistling Thorn (Acacia drepanolobium) acacia tree, Costa Rica
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Mark Moffett / Ant (Pseudomyrmex sp) ripping up vine that disturbs its host Whistling Thorn (Acacia drepanolobium) acacia tree, Costa Rica
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Mark Moffett / Ant (Pseudomyrmex sp) ripping up vine that disturbs its host Whistling Thorn (Acacia drepanolobium) acacia tree, Guanacaste, Costa Rica
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Mark Moffett / Ant (Pseudomyrmex sp) ripping up vine that disturbs its host Whistling Thorn (Acacia drepanolobium) acacia tree, Costa Rica
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Mark Moffett / Ant (Pseudomyrmex sp) pair drink nectar from Whistling Thorn (Acacia drepanolobium) acacia tree and protect the tree from leaf eating enemies ensuring mutual survival, Costa Rica
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Mark Moffett / Ant (Pseudomyrmex sp) trio drink nectar from Whistling Thorn (Acacia drepanolobium) acacia tree and protect the tree from leaf eating enemies ensuring mutual survival, Costa Rica
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Mark Moffett / Ant (Pseudomyrmex sp) gathers carrot-like growths from Whistling Thorn (Acacia drepanolobium) acacia tree for delivery to larva in nest, in return for baby food Ant protects Acacia, Costa Rica
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Mark Moffett / Whistling Thorn (Acacia drepanolobium) tree occupied by mutualist Ant (Crematogaster mimosae) the Ants attack anything eating their tree-protecting the tree's leaves, Africa
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Mark Moffett / Patas Monkey (Erythrocebus patas) eating swollen base of Whistling Thorn (Acacia drepanolobium) acacia tree thorn occupied by Parasitic Ant (Tetraponera sp) parasite causes tree to look bare and sickl...
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Mark Moffett / Whistling Thorn (Acacia drepanolobium) tree with thorns occupied by Ant (Tetraponera penzigi) parasite, Africa
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Mark Moffett / Ant (Pseudomyrmex sp) gathers carrot-like growths from Whistling Thorn (Acacia drepanolobium) acacia for delivery to larva in nest, in return for baby food Ant protects Acacia, Costa Rica
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Carine Schrurs / RF- Male Gerenuk (Litocranius walleri) standing on hind legs feeding on Acacia. Samburu National Reserve, Kenya. (This image may be licensed either as rights managed or royalty free.)
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Shin Yoshino / Leopard (Panthera pardus) resting in Whistling Thorn (Acacia drepanolobium) acacia tree, Masai Mara, Kenya
