Some 250 species live on 64 acres of riverside bosque here among ancient cottonwoods. Open-moat exhibits with animals in naturalized habitats are a treat for zoo-goers. Major exhibits include polar bears, giraffes, sea lions (with underwater viewing), the cat walk, the bird show, and ape country, with gorillas and orangutans. The zoo has an especially fine collection of elephants, koalas, polar bears, reptiles, and native Southwestern species. The Thunderbird Express Train operates in a nonstop loop around the zoo, except on Mondays. As well, the Rio Line operates between the zoo and the Albuquerque Biological Park. There are numerous snack bars on the zoo grounds, and La Ventana Gift Shop carries film and souvenirs. Check out the seal and sea lion feeding at 10:30am and 3:30pm daily and the summer Zoo Music Concert Series.