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is thought to have been about 3 m (10 ft) tall and exceeded 100 kg (220 lb) in weight. It differs from its relatives in its larger size, length of its beak and details of its skull. It is thought to have been a fast-running ground predator.
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group of large, predatory birds, which lived in what is now
Argentina about 15 million years ago. The only known specimen was discovered by
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with long hind limbs, small wings, huge skulls and hooked beaks. At 716 mm (28.2 in) long, the skull of
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honors its discoverer. The holotype consists of a nearly complete skull, a
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73:in 2007. The generic name references a spirit in
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18:Knowledge:Today's featured article
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61:student Guillermo Aguirre-Zabala in
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125:Zufar ibn al-Harith al-Kilabi
69:of the new genus and species
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155:More featured articles
33:Reconstructed skeleton
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89:. The discovery of
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83:lower leg bone
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59:high school
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63:Patagonia
148:By email
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99:Kelenken
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87:toe bone
67:holotype
41:Kelenken
141:Archive
55:extinct
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