The zoo is a blend of forests, wild animals, aviary, and responsible animal management. Sponsored by HM Queen Sirikit, the zoo has grown in size, scope and importance. More than 300 species and 8,000 animals populate the 5,000 rai sanctuary. Six of the newer residents of the zoo are rare white tigers from the Memphis Zoo in the US. Khao Kheow is described as a "wildlife bank" as many animals are on the endangered species list. The zoo is known for success in breeding some of these endangered animals. One such project is breeding the rare clouded leopard. Other endangered mammals at the zoo include the Asian wild dog, Malayan tapir, and tiger. Rare Asian bird species draw bird watchers from around the world. The walk-though aviary is Asia's second largest with over 80 species. Endangered bird species at the zoo include the black necked stork and white crested laughing thrush. The zoo features a daily 'penguin parade' show and a night safari into the African Savanna and Cats Complex zones.