But tell us easytigger - how did you find that out the hard way?
Well when I worked at Chessington the windows on thelion and tiger enclosures were to begin with on 19mm laminated windows, and they seemed to do the trick, I'd seen the cats jump up at them, even run at them at full speed, no problem at all.
One day however just after a public feed I went down to answer any questions, literally the 2nd question I got asked was how thick are these windows, I reassured them that they were lion proof, no sooner had I said this then Ashok took a small run up maybe 10-15ft jumped up at the window and shattered it, only the laminate was keeping it in place!!!!
I nearly grew a tail, grown men screamed and ran off, the area was quickly evacuated, and the dangerous animal escape proceedure put into place as a precaution, I opened the lion house up thankfully Ashok came straight, with a look on his face as if to say 'bloody hell that wasn't meant to happen' his sisters kamlesh and gita were really stressed by it all and took a while for them to be shut in, but it was a close call, one more hit of the window and he'd of been out and I'd have been a gonna (we had a love hate relationship)
It transpires that the wooden window frames and warped in hot weather, adding pressure to the glass, and Ahok just hit it in the right place.
The windows were quickly replaced with 32mm glass and steel frames