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The holotype skull is about 716 mm (2.3 ft) long from the tip of the beak to the center of the sagittal nuchal crest at the upper back of the head (a size likened to the size of a horse's skull), making it the largest skull of any known bird. The hind end of the skull is 312 mm (12 in) wide.
Kelenken guillermoi, from the Langhian stage of the Miocene epoch, some 15 million years ago, discovered in the Collón Curá Formation in Patagonia in 2006, represents the largest bird skull yet found. The fossil has been described as being a 71-centimetre (28 in), nearly intact skull.
The discovery of Kelenken clarified the anatomy of large phorusrhacids: flightless birds with long hind limbs, small wings, huge skulls and hooked beaks. At 716 mm (28.2 in) long, the skull of Kelenken is the largest known of any bird. Kelenken is thought to have been about 3 m (10 ft) tall and exceeded 100 kg (220 lb) in weight. It differs ...
The discovery of Kelenken clarified the anatomy of large phorusrhacids: flightless birds with long hind limbs, small wings, huge skulls and hooked beaks. At 716 mm (28.2 in) long, the skull of Kelenken is the largest known of any bird. Kelenken is thought to have been about 3 m (10 ft) tall and exceeded 100 kg (220 lb) in weight. It differs ...
Of the skull, only the premaxilla, frontal (top orbit bone), pterygoid (palate bone), quadrate (skull joint bone), orbital process, and two quadratojugals (cheek bones) have been mentioned in scientific literature. The skull is estimated to have been between 36 centimeters (14 in) and 56 centimeters (22 in) in length, one of the largest known ...
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Reconstructed, it was probably about 64.5 cm long, which roughly corresponded to the known skull of Phorusrhacos, but was slightly smaller than that of Kelenken. When viewed from above, it had a wedge shape, reaching a width of 32.3 cm at the occipital bone and a height of 12.7 cm.
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