Perito Moreno is an awesome Glacier and one of the most active in the world. It advances at a rate of 2m per day! The first echoing crack was a shock and we heard plenty more throughout the day and saw chunks break off.
I took loads of photos but can’t seem to get them onto the blog (managed this one!)but they’ll have their own album on Snapfish soon(ish).
A quick overview (by someone else) of the glacier with photos can be read here…