Well, they give it a shave in the next episode - should help keep it cool.
My main problem with it, is they assume that the vegetation that we have now would be suitable. It also seems they wont have enough for all the animals.
In addition, the pens are made out of wood - and dont look terribly strong either. After all, if a T-Rex can cause havoc with metallic cages, what would 2 T-Rex's do with wooden pens ? Perhaps in the last episode, everyone & everything gets eaten
And another thing, the Nigel doesn't have any weapons, which is a bit stupid...
Finally - who owns the park, and where does the money come from - there are no visitors...