These top institutions pair stellar animal experiences with important conservation work.

When planning a visit, double-check your chosen zoo is as ethical as possible.

A portion of every entry ticket supports these efforts.

Gorillas at the San Diego Zoo

Credit:Courtesy of San Diego Zoo Wildlife Alliance

And it has done exactly that since opening in 1969.

The recent return of itsgiant pandasis another compelling reason to visit.

It also happens to be one of the best thanks to its rare animal exhibits and extensive conservation work.

Penguins at the San Diego Zoo

Courtesy of San Diego Zoo Wildlife Alliance

And thats a good thing, considering its inhabited by nearly 6,000 creatures.

Roughly 200 species include everything from African lions to snow leopards.

It also boasts the areas oldest conservation program.

The Smithsonian National Zoo Shows Off Giant Pandas

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See everything from capybaras and chimpanzees to kangaroos and giraffes.

you’re free to sometimes even view native kiwi birds, depending on the zoo’s rescue efforts.

Come back for the Night Safari to explore the zoo after dark.

Giraffes in front of the Sydney Opera House at Taronga Zoo in Sydney, Australia.

James D. Morgan / Getty Images

), a huddle of penguins, and Scotlands only two-toed sloths.

Take advantage of the buy-one-ticket-go-all-year deal to visit multiple times, including during themed Halloween and Christmas events.

Behind-the-scenes tours and wildlife feeding experiences are also available for an extra fee.

Singapore Zoo Welcomes A Star To Its Herd Of Zebras

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The on-site cafe serves up tasty Cajun and Creole bites like crawfish etouffee and hand-battered catfish nuggets.

Koala at Australia Zoo

Courtesy of Australia Zoo