Nope, wish I had the money for those though!
The Gorilla was with the Canon 100-300.
The rest were with Canon 70-300 IS USM.
Except for the Tiger, the rest are an 80% crop, or thereabouts. Probably 90% with the Snow Leopard.
500 would be way overkill at our zoo. 400 would be handy, and a 300 2.8 would be beyond words wonderful for the Tiger enclosure but no can do. It's a very dark enclosure so I alwayws have to use high ISOs.
Nat