Polar bear shatters glass

Here we see a clearly devious polar bear conducting a little destructive testing on the window of his enclosure. Lucky for us two Dutch documentarians were there filming in front of the aquarium (is that the correct term for where polar bears are kept?).

I saw something along this line a few years back when they were installing the new polar bear exhibit at the Cincinnati Zoo. Apparently the forklift tapped the glass a bit more firmly than intended, shattering the glass in a gorgeous spider-web pattern.. The zoo left the glass up initially with a note explaining that the shattering was a show of how well the glass was designed. Even though one of the panes shattered, the other panes laminated together had held the strength.

I'm thinking that we're got a composite of laminated glass here. With the shattering, spider-web pattern, I think we might have tempered glass, too. Thoughts?

Source - care2