Perhaps we are thinking of similar beings given the same name? (The ones I have seen are as tall as a Roegadyn - one of the Six Races. [Hyur, Elezen, Lalafell, Miqo'te, Roegadyn, and Au Ra.] 7'6.7", if you require the measurements. However, these ones are specially bred and tames - wild ones can grow up to quadruple that size.
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There may be larger, but I have not seen them.)