[@Ryonara]
Well, one would use History if it was a particular known dragon or you tried to get your by comparing this dragon to one you have heard stories of. Arcana does not fit too well... I'd say it would be a difficult-ish Nature check, but History would be available if sufficient background of dealing with/studying about dragons was presentable as a reason to use that.

Anyway, seems the turn goes to [@Norschtalen].