These are the United Kingdom's largest zoological gardens, where 5,000 animals live in spacious near-natural surroundings, set on 80 acres of award-winning gardens. Chester is regarded as one of Europe's top zoos. Many rare and endangered creatures breed freely in large, open, near-natural enclosures. Some of the major features of the Zoo include: Tropical House, Penguin Pool with under-water viewing, Chimpanzee House and island, Aquarium, Asian Elephant House and island, Children's Farm, one of the UK's largest bird collections, Black Rhinos, Zoofari Overhead Monorail and Waterbus. Zoo open daily, except Christmas Day.