We got a late start at the zoo. I didn't think of...

We got a late start at the zoo. I didn't think of what time it closed. As a courtesy, I feel like the ticket attendant should have said they close at 6pm. We were not finished seeing everything and over the loud speaker they announced it was 6pm and the zoo was now closed and to exit. I feel they should make the announcement prior to closure, by maybe 30 mins to say the zoo will be closing soon so if we still had something we really wanted to see, we could have.
Also, the train ride was extremely squeaky and loud. They definitely need to oil the thing to make it more enjoyable.
I did like how open the enclosures were and how much room there was to view the animals.