Penguin evacuees made a star-studded post-Katrina return via a chartered FedEx flight here, waddling home down a (FedEx) purple carpet as news cameras rolled. Then, rescued sea turtles were rehabilitated here after the Gulf oil spill. These instances point up just how topical and relevant this world-class aquarium is, besides being full of cool fishies. Its focus on the Mississippi and Gulf of Mexico is highly entertaining and painlessly educational for kids and grown-ups. There’s plenty of interactivity, like the “Geaux Fish!” exhibit that follows fish from the waters to the plate. We love the huge interior rain forest complete with birds and piranhas, and being able to peer below the surface of a swamp. Not to be missed are a fine exhibit on frogs, a rare albino gator, and a manta-ray touch tank. The outdoor splash fountain is irresistible on a warm day. Right on the edge of the Quarter, it’s a handy refuge from the heat or rain and part of a complex of Audubon attractions, including the Imax-style Entergy Giant Screen Theater next door; the Insectarium a block away; and the Audubon Zoo uptown. Tip: If you plan to visit more than one, the combination admission package saves up to $30 per person.