Tairneanach, Sgaeyl, and their size compared.
Since in the book they specify the can't tell dragon breeds apart besides their tails, and they never mention any sexual dimorphism, I assume Sgaeyl and Tairn are only different insomuch as their sizes, where Sgaeyl has very slightly less stockiness because she is slightly smaller (or at least as far as I know only having read the first book).















