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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.
Little is known of its body structure, but it seems to have been less wide-footed than Devincenzia, with a proportionally much stronger middle toe. [3] In its initial description, Titanis has been suggested to be larger than the African ostrich and more than twice the size of South American rhea . [ 3 ]
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 ...
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The eye was seemingly placed in the antorbital fenestra, the tip of the snout is missing, the skull is shrinkwrapped to hell and back, the top of the skull has a weird second bump at the back rather than being flat, two rows of big blade-like osteoderms are unlike anything seen in actual phytosaurs.
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.
Phorusrhacos had a skull nearly 65 centimetres (26 in) long, stood nearly 2.4 meters (7 ft 10 in) tall, and probably weighed nearly 130 kilograms (290 lb), as much as a male ostrich. [ 7 ] [ 8 ] It had very strong legs, capable of running at high speed, stubby, flightless wings, a long neck, and a proportionately large head.