also what AI do they have do they pick up things in combat like the 1 did in the E3 demo trailor in TODD MODE with the giant

Humm...they rap in dragon language. True story.

I've seen them only pick up and throw around poor things while they're sitting on the ground. If they do fly off with any, then I can't recall or I haven't actively seen them do it. Other than that, from observing a few specimens, their favourite pastime seems to be flying in circles around mountain tops while roaring or philosophising in the same places (in the case of Paarthurnax that is).

Well they sleep sometimes.

When I was running through a forest I literally bumped into one. I tell you it was the biggest shock of my life.

I think the Dragon was rather surprised as well.

When an NPc stands there and tanks a dragon, the dragon can pick that NPC up, shake them and toss them to the side. I've seen this happen numerous times. Its rather funny seeing an old lady NPC try to tank a dragon, while punching it in the face. Only to be grabbed, shaken and tossed off like a sack of potatos.

They bake sweet rolls

I'm fairly certain that is what Alduin is doing.

Alduin- "Oh sh!t the player has reached a point in the main story. I need to hurry up and ressurect my buddy and get back to my moutain in time to take my sweet rolls out or there going to burn!"

They live a very boring life of sitting on very large rocks and rock-like structures becoming more and more pissed off because they're so bored. So when some poor sot happens to slog along in their vicinity their rage takes over and they go insane...

And drink milk

From what i can play so far on my PS3(lol bugs) The dragons always seem to fly when i have melee weapons. and when i have bows they land and run up to me.. ugh

They look for things to slaughter when they arent busy slaughtering, and lol, its funny how everyone hates on the trailer because there was something in it that they havent seen, It does happen, Its VERY rare as Todd himself said DURING the video, get your head out of your ass please

Dragons eat ice cream and continue being nerds while off-duty.
http://nerdapproved.com/gaming/skyrim-dragons-are-grammar-nerds-comics/

Llounge amongst their loads of treasure.