Lonely Planet review
Established in 1831, the 28-hectare Dublin Zoo just north of the Hollow is one of the oldest in the world. It is well known for its lion-breeding program, which dates back to 1857, and includes among its offspring the lion that roars at the start of MGM films. You'll see these tough cats, from a distance, on the 'African Savanna', just one of several habitats created in the last few years.
The zoo is home to roughly 400 animals from 100 different species, and you can visit all of them across the eight different habitats that range from an Asian jungle to a family farm, where kids get to meet the inhabitants up close and even milk a (model) cow. There are restaurants, cafes and even a train to get you round.