A lot smaller than I thought, give yourself no more than an hour here unless you're staying for the feeding or shows.
There are 3 main "sections" and each section is neatly categorized based on the theme. My favourite was the outdoor part where you get to be very close to the animals and get a good shot of them. You can also get pretty close to the birds inside the "tropical" section as they are not caged and free to walk/fly around.
It's a nice "drop by for a quick stroll" if you have the time during your vacation.