Guild Wars 2

I’m having some trouble with the standard lvl 79 Ice Wurms in Frostgorge. It’s not that they are taking a lot of my health, I do just fine there, but I am positive I can reduce my incoming damage more than I currently do.
Looking at the wiki, http://wiki.guildwars2.com/wiki/Ice_Wurm , it shows the mobs attacks as “Bites, Freezes”. They also “steal” “ice shard stab, throw gunk”. This does not seem to account for the large boulders they throw, or the underground burrowing they do which appears to cast “unsteady ground”.
Is there a more extensive list of what skills they use? Is there a way to dodge the unsteady ground and still get close enough to hit the wurm (using a GS warrior)?

they don’t steal thats a list of what thieves can steal from them

And with the wiki it doesn’t take into account that there are different variants of ice wurm.

Some wurms have siege attack listed on them (even though basically all of them do it)

That said the boulder is the freeze attack, for dodging the burrow as soon as you see the wurm straighten upwards dodge back, you’ll avoid the burrow damage and allow you to move closer again straight away.

Thank you.
Glad to know about the steal list too. Very useful.