If you look at that list and go pretty far down it, you'll see the "Dragon Slayer" achievement.
In case you're too lazy to look:
[quote][b]D R A G O N S L A Y E R[/b]
[i]Kill a champion of the Dark[/i][/quote]
Now we have a dragon popping up in the final release trailer for Destiny.
([url=http://youtu.be/jv7vqCmt6wY]Link here[/url], watch at [b]00:48[/b].)
[b][u]EDIT:[/u][/b]Found a video that showcases dragons on Venus. He looks in the sky and while the red ones may just be bats, the blue ones are definitly dragon like. [url=http://youtu.be/3EtKFYyoOr0]Link here.[/url]
This achievement is by far all the proof we need that the flying beast in question is , in fact, a [b]dragon[/b].
[i]*creams pants*[/i]
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1 link to confirm all dragon theories http://destinydb.info/inventory/item/3000100318