Yes, the creators have not yet added the Valkyrie or the eternal daylight dude yet.

is the wild blue moas in people youtube vids just my imagionation then?

They are just your imagination. The moas you see on youtube vids are Cockatrices , they are wild agressive moas that will try to attack you whenever you get close from 'em. Please refer to the link above to know more about 'em.

My bad, I have given wrong information. Yes, they are spawning, but the rate is Too low. They mostly spawn near recently loaded chunks, so be aware of those as you have a higher chance to find one. You Cannot tame wild moas, but you can get the eggs they lay down and use those to get your own moa.

I have a question how can I difference a Bronze Dungeon from a Silver or Gold dungeon? I mean from the outside aesthetically speaking.

If you are playing the Aether II Alpha version there has been implemented, currently, only one dungeon (Slider's Labyrinth) so that should solve your question.

If you are playing any of the early versions, you can diferentiate by the following:

Bronze dungeons will have Sentries as normal dungeon enemies

Silver dungeons will have Mimics and Valkyries as normal dungeon enemies (and several floors)

Gold Dungeons will only have the Boss (Sun Spirit) as enemy.

I wondered if in creative if you can die in dungeons. It keeps on sending me a messange aying you can die even if I'm on creative

P.S: this is on a single player world if that helps