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• n  slender East African antelope with slim neck and backward-curving horns

• That's why the gerenuk a type of antelope evolved its long neck and stands on its hind legs, and why the giraffe evolved its long neck.
• That's why the gerenuk a type of antelope evolved its long neck and stands on its hind legs, and why the giraffe evolved its long neck.

• Litocranius walleri