Skulls have been found with some interesting ornamentations including bony crests and horns above the eyes, pits and grooves. These were possibly for the purposes of . The forelimbs of abelisaurs such as Carnotaurus were short and may not have been used. Fossils from this family of have, so far, only been found in South America, Africa and the Indian Subcontinent.
Source: http://www.bbc.co.uk/nature/life/Abelisauridae
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