of Masai giraffes, Grévy's zebras and Somali wild ass. Bird's World: A large building dating back to the zoo's 1912 opening containing dozens of bird species in four different environments: swamp, rainforest, desert, and wetlands. Outside, there is a large flight cage for Andean condors and Steller's sea eagles, and other birds from around the world including black crakes, boat-billed herons, Gouldian finches, great hornbills, green aracaris, Indian peafowl, kea, sunbitterns, violet turacos and various waterfowl. A three-year-old male Steller's Sea Eagle named O-washi debuted in May 2018. This building originally opened in 1912 (the same year the zoo itself opened to the public) and was renovated around the mid-1970s to exhibit birds in more naturalistic environments. Butterfly Landing: a seasonal exhibit containing over 1,000 butterflies in free flight. This large outdoor "tent" also has streams and a waterfall surrounded by numerous plant species. The exhibit first opened in 1997. Children's Zoo: A three-acre complex which includes a new, walk-through aviary with assorted birds, black-tailed prairie dogs, red pandas, turtles, Baikal teals, and Reeves's muntjacs. There is also the Franklin Farm, a barn with paddocks for livestock and an interaction area for goats with various outbuildings. The animals include Poitou donkeys, Morgan horses, Guinea hogs, Nigerian dwarf goats, Black Welsh Mountain sheep, heritage breeds of chickens and barn owls. There is also a spotted hyena exhibit, outside the Tropical Forest, that is not part of any major area. Attendance The zoo's attendance has been rising in the last few years, but has never equalled the numbers when it was free to all. It hopes in the future to have one million visitors to qualify as a regional zoo. 1920: 2 million visitors (when the zoo was free) 1984: 100,000 visitors (after the renovated Children's Zoo opened) 1988: 35,000 visitors 1990: 200,000 visitors (after the African Tropical Forest opened in 1989) 1993: 132,832 visitors 1994: 153,310 visitors 1996: 130,000 visitors 1997: 130,000 visitors 1998: 240,000 visitors 2006: 266,997 visitors 2007: 308,166 visitors 2008: 326,543 visitors 2009: 342,313 visitors 2014: 418,167 visitors 2016: 353,891 visitors Notes External links Charity Navigator/Zoo finances summary Buildings and structures in Boston Parks in Boston Tourist attractions in Dorchester, Boston Zoos in Massachusetts