There's no record of Leo Dragons ever living on Earth until recently. Leo Dragons seemed to simply fly down from the stars above one year in late July, then flew back the next month. They're highly sought after due to their limited time in the Dragon Islands, but if you manage to hatch one, it'll stick around forever.
When Leo Dragons fly down to the Dragon Isles, the constellation Leo seems to become a bit dimmer. Some stars go out of focus or can't be seen. Yet when the dragons leave the Isles, the constellation brightens again. Why? How? Your guess is as good as anyone's.
Leo Dragons are occasionally mistaken for lions by humans. Naturally, lions don't fly, so humans usually either convince themselves their eyes are playing tricks on them or that they're going insane. In any case, legends and art across the world have paintings depicting lions with wings.
Epic Leo Dragons have the full shape of their constellation printed and gleaming brightly across its magnificent coat. The stars on their body blaze so bright that, when flying at night, they've been known to steer ships off course who use the constellation Leo as a navigational tool.