CNN CNN International April 18, 2015 09:56:00
It looks intimidating it happens every couple of years. >> its rare the gorillas actually break the glass, but occasionally the glass will break op its own, but they have broke didnt before in the past, and its usually more an engineering thing than it is a gorilla thing. >> reporter: these windows are designed to stay in tact to keep both animals and the public safe. >> its a triple layer laminate. theres actually three panes of glass on top of one another. if one is broken the other two are in...
Source: archive.org