Opening in 1844 and covering more than 80 acres, the Berlin Zoo is the oldest and largest zoological park in Germany. Overcoming the ravages of the Second World War, it has become one of the world’s most popular zoos, welcoming millions of visitors each year. It displays almost 20,000 animals from more than 1,400 different species. This is one of the most comprehensive collections in the world. The first animals were donated by the King of Prussia. It is the former home of Knut, the polar bear cub, and Bao Bao, a Giant panda. Many of the exhibits are designed to mimic the animals’ natural habitats. The regularly scheduled animal feedings are popular attractions. Visitors can see playful orangutans, cuddly koala bears, endangered rhinos and arctic penguins as well as lions, tigers, elephants and a menagerie of colorful birds. The aviary is housed in the Alfred Brehm Animal House, one of the world’s largest zoological buildings. Another architectural feature is the Asian influenced Elephant Gate. Open year round, the Berlin Zoo is easily accessible by public transportation.