Corral a group of T-Rexes in a large cage. Make sure
they are well nourished. Allosaurs also work just as well, and
may work even better when with T-Rex. Wait until they are full
grown. By this time you should have a good sized zoo. This works
best on large maps with lots of statues and objects, and quite
a lot of customers and staff. If you want to save any one from
the apocalypse, make a large electrified exhibit and put the animals
you want to save and a few commodities such as stalls, rest rooms,
trash cans, benches, and finish it off with some plants and grass.
The chosen ones who get to be in the "anti-apocalypse"
cage will be living well, while out side this lush environment
is a wasteland full of despair and misery. To even further increase
the entertainment value of all this, the Allosaurs and T-Rex will
eat the guests and staff.