Hello can I get a ticket there also do we need to get it online

You can get your tickets at the zoo yes.

You can order on-line or purchase there. We purchased on-line but saw people purchase at the machines located before the entrance

Yes you have to order online

I thought so too, but I also saw people in a line at some kiosks just before the entrance

It seemed that you needed to get the tickets online and reserve an entry time

Either/ or

You can do both now